atodorov.org

Fixing Display Brightness on MacBook Air with RHEL 7

One issue with RHEL/CentOS/Fedora on MacBook Air laptops is brightness control and backlight behavior after suspend/resume. I've found the solution here and only tweaked it slightly for my use case.

mba6x_bl doesn't load automatically

The reason being the driver matches older hardware:

$ modinfo mba6x_bl
filename:       /lib/modules/3.10.0-229.1.2.el7.x86_64/extra/mba6x_bl/mba6x_bl.ko
alias:          dmi:*:pnMacBookAir6*
license:        GPL
description:    MacBook Air 6,1 and 6,2 backlight driver
author:         Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
rhelversion:    7.1
srcversion:     4D069C8EB0E470AF27E7F8D
depends:        video
vermagic:       3.10.0-229.1.2.el7.x86_64 SMP mod_unload modversions

My system is MacBookAir7,2 and doesn't match the module alias. So a quick fix was needed. For more info about MODULE_ALIAS see ArchWiki. Alternatively on Red Hat based systems you can place a config file under /etc/sysconfig/modules, see the docs for more details.

intel_backlight driver is in the way

On older systems mba6x_bl doesn't get used automatically. The problem is the offending intel_backlight driver which gets used instead. To workaround it add this xorg.conf snippet:

$ cat /etc/X11/xorg.conf.d/98-mba_bl.conf
Section "Device"
    Identifier      "Intel Graphics"
    Driver          "intel"
    Option          "Backlight"     "mba6x_backlight"
EndSection

For more info see RHBZ 989555.

Everything in one go

If you are using RHEL 7 or CentOS 7 (version 7.1 required) instead of Fedora you can take a look at my Macbook Air RHEL 7 repository.

Posted by Alexander Todorov on Wed 29 April 2015

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Disabling MacBook Startup Sound in Linux

There is an easy way to disable the MacBook startup sound (boot chime) even after wiping out OS X and installing Linux.

This sound can be easily disabled if you mute the volume in OS X and shutdown the computer. The value is stored in NVRAM.

Reboot the computer and hold Cmd+Alt(Option)+R. This will start OS X Internet recovery mode;
Open the terminal and issue the following command
```
nvram SystemAudioVolume=%00
```
Reboot.

Voila. In Linux try this:

# efivar -l | grep SystemAudioVolume
 7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolume
 7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolumeDB

# efivar -n 7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolume -p
GUID: 7c436110-ab2a-4bbb-a880-fe41995c9f82
Name: "SystemAudioVolume"
Attributes:
    Non-Volatile
    Boot Service Access
    Runtime Service Access
Value:
00000000  00                                                |.               |

# efivar -n 7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolumeDB -p
GUID: 7c436110-ab2a-4bbb-a880-fe41995c9f82
Name: "SystemAudioVolumeDB"
Attributes:
    Non-Volatile
    Boot Service Access
    Runtime Service Access
Value:
00000000  00 
#

Note 1: Before disabling both variables had non zero values. Also SystemAudioVolumeDB doesn't seem to have any effect.

Note 2: RHEL or CentOS users need to rebuild efivar from the Fedora src.rpm.

Note 3: several Internet sources suggest that writing EFI variables from Linux may sometimes corrupt your Apple firmware. I didn't research this any further. If you happen to figure out how to successfully write to these variables under Linux please let everyone know in the comments (in case OS X recovery mode goes missing, you know).

Thanks to my reader Alexander, who gave me the hint in a previous blog post.

Posted by Alexander Todorov on Mon 27 April 2015

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Compiling Broadcom wl-kmod WiFi Driver for RHEL 7

After I got my MacBook Air installed with RHEL 7.1 the first priority was getting wireless working. First check if your device isn't already supported upstream. Mine isn't

14e4:43a0: Broadcom Corporation BCM4360 802.11ac Wireless Network Adapter (rev 03)

Next grab the src.rpm files necessary to build the wl driver from RPM Fusion. For akmods-0.5.2-1.fc21.src.rpm, broadcom-wl-6.30.223.248-2.fc21.src.rpm, kmodtool-1-23.fc20.src.rpm just execute rpmbuild --rebuild against each file and install kmodtool and akmods.

Then you need two more files buildsys-build-rpmfusion and wl-kmod. The first one is a helper tool containing list of recent kernels to build against, the later one is the driver source itself. Both needed minor modifications before building on RHEL 7.

I've created my own buildsys-build-rpmfusion package listing the current kernels for RHEL 7.1. For wl-kmod I've introduced a patch which modifies the other patches in the package so it builds correctly on 7.1.

Note: I don't know if there's a define which can be used to detect if we're building on RHEL (maybe I can define my own) but direct kernel version number comparison doesn't work here because Red Hat backports chosen functionality from more recent kernels without changing the version number. This approach may not be the best one but I've tried to keep it clean for easier maintenance in the future and it got me started very quickly.

Build the modified buildsys-build-rpmfusion and:

yum install buildsys-build-rpmfusion-7-1.x86_64.rpm buildsys-build-rpmfusion-kerneldevpkgs-current-7-1.x86_64.rpm

Build the wl-kmod package and:

yum install akmod-wl-6.30.223.248-5.el7.x86_64.rpm broadcom-wl-6.30.223.248-2.el7.noarch.rpm kmod-wl-3.10.0-229.el7.x86_64-6.30.223.248-5.el7.x86_64.rpm kmod-wl-6.30.223.248-5.el7.x86_64.rpm

If necessary re-create your initramfs image to include wl.ko.

Posted by Alexander Todorov on Mon 27 April 2015

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Installing Red Hat Enterprise Linux 7 on MacBook Air 2015

Recently I've upgraded to a new MacBook Air (13 inch, early 2015) laptop and luckily enough I'm running Red Hat Enterprise Linux 7.1 on it. Here is how to install it.

Prepare boot media

The easiest method is to boot from a USB stick which holds either the entire DVD or just boot.iso. Since I happened to find a 1GB only USB stick I went for the boot.iso. dd if=boot.iso of=/dev/sdb is the only thing you need to prepare the boot media.

Initial boot

Mac boot menu

While computer is booting hold the (left) Alt (Option) key to enter Startup Manager. Wait a second or two before it displays your local hard drive and the USB boot media. Select the option EFI boot to boot the anaconda installer.

Installation

Booting from a boot.iso means I need to use the network to grab the rest of the installation. Because the wireless card needs proprietary drivers I've tried both USB to Ethernet adapter and USB tethering with my phone.

Note: initially I have forgotten to plug in my USB networking card which resulted in bug #1191286. After cold-plugging and rebooting the system everything was fine. Subsequently I don't see any problems with the USB networking card. The bug should be fixed in RHEL 7.2 btw.

Note: I've been using a USB docking station from Plugable for years because their products are Linux friendly. In particular the networking chip is ASIX and there is no problems with drivers for Linux.

UPDATE 2015-05-04: You should also be able to use a Thunderbolt to Ethernet adapter which is more common for Apple users. See here for more info;

In my case I've wiped out the entire SSD disk b/c I don't care about dual boot. Previously I've heard about anaconda crashing while it tries to detect the Mac OS file system. I've played around with Rawhide before going for RHEL 7.1 and didn't see any problems related to foreign filesystems.

I've gone with the default partitioning scheme while slightly modifing the partition sizes, etc.

Post install

There are several issues which still need attention. I didn't have enough time in the last few days to check these out:

Things which work

GNOME 3 sucks big time. Fortunately I was able to install MATE Desktop from EPEL;
Wireless card needs drivers; I've managed to compile them myself, see here;
Display brightness doesn't seem to work at all. On top of that the display goes full black after suspend-resume. I could barely see anything on it. Fixed here!
There is a very annoying boot chime ~~which I have no idea how to disable~~ Fixed here;
The onboard keyboard is quite annoying for previous ThinkPad user like myself. Most importantly I need to press Fn to activate the F1, F2, etc keys which I use a lot in mcedit. Fixed here;
Output sound works - both speakers and headphones;
Microphone works (tested with a hands free device);
Power manager was reporting my battery life totally wrong but after a full discharge/recharge it seems to have calibrated itself;
ATrpms and EPEL are still missing some codecs for RHEL 7 which means no movies; codecs seem to work now with the NUX Desktop repos. Not sure what I was missing when testing it initially;
UPDATE 2015-05-04: I do have a Thunderbolt to Ethernet adapter and hot-plug seems to work despite claims that this is not supported in Linux. See here for more info;
UPDATE 2015-05-05: Presenting via external projector works with a USB to VGA adapter. See here;

Things that don't work yet

UPDATE 2015-04-30: I'd like to remap the Cmd key to the Menu key found in PC keyboards;
Camera doesn't work, reverse engineering a driver is in progress;
I'm missing the ThinkLight from my X220, however the integrated Broadcom FaceTime HD camera doesn't seem to have a LED flash which can be repurposed for this task;
I need a CPU temperature monitor and maybe CPU fan speed needs adjustments;

UPDATE 2015-04-28: Check the list above for links to wifi and backlight drivers and how to disable the boot chime.

UPDATE 2015-04-29: You can find precompiled RPMS in my Macbook Air RHEL 7 repository.

UPDATE 2015-04-30: Added more links and split the list into stuff which already works and stuff that doesn't.

UPDATE 2015-05-04: Added info about Thunderbolt to Ethernet adapter.

UPDATE 2015-05-05: Added info about USB to VGA adapter.

Fedora 22 on MacBook Air

I did try Fedora 22 Beta and experienced bug #1215458. Also for some reason the installation hit an error downloading a package and didn't let me retry but forced me to exit the process.

I'll continue posting my updates until the system runs smoothly like it is supposed to.

Hardware info

ADDED ON 2015-05-02

# dmidecode 
# dmidecode 2.12
# SMBIOS entry point at 0x8afae000
SMBIOS 2.7 present.
32 structures occupying 1663 bytes.
Table at 0x8AFAD000.

Handle 0x0000, DMI type 7, 19 bytes
Cache Information
    Socket Designation: L1 Cache
    Configuration: Enabled, Not Socketed, Level 1
    Operational Mode: Write Back
    Location: Internal
    Installed Size: 32 kB
    Maximum Size: 32 kB
    Supported SRAM Types:
            Synchronous
    Installed SRAM Type: Synchronous
    Speed: Unknown
    Error Correction Type: Parity
    System Type: Data
    Associativity: 8-way Set-associative

Handle 0x0001, DMI type 7, 19 bytes
Cache Information
    Socket Designation: L1 Cache
    Configuration: Enabled, Not Socketed, Level 1
    Operational Mode: Write Back
    Location: Internal
    Installed Size: 32 kB
    Maximum Size: 32 kB
    Supported SRAM Types:
            Synchronous
    Installed SRAM Type: Synchronous
    Speed: Unknown
    Error Correction Type: Parity
    System Type: Instruction
    Associativity: 8-way Set-associative

Handle 0x0002, DMI type 7, 19 bytes
Cache Information
    Socket Designation: L2 Cache
    Configuration: Enabled, Not Socketed, Level 2
    Operational Mode: Write Back
    Location: Internal
    Installed Size: 256 kB
    Maximum Size: 256 kB
    Supported SRAM Types:
        Synchronous
    Installed SRAM Type: Synchronous
    Speed: Unknown
    Error Correction Type: Single-bit ECC
    System Type: Unified
    Associativity: 8-way Set-associative

Handle 0x0003, DMI type 7, 19 bytes
Cache Information
    Socket Designation: L3 Cache
    Configuration: Enabled, Not Socketed, Level 3
    Operational Mode: Write Back
    Location: Internal
    Installed Size: 4096 kB
    Maximum Size: 4096 kB
    Supported SRAM Types:
        Synchronous
    Installed SRAM Type: Synchronous
    Speed: Unknown
    Error Correction Type: Multi-bit ECC
    System Type: Unified
    Associativity: 16-way Set-associative

Handle 0x0004, DMI type 4, 42 bytes
Processor Information
    Socket Designation: U3E1
    Type: Central Processor
    Family: Core i7
    Manufacturer: Intel(R) Corporation
    ID: D4 06 03 00 FF FB EB BF
    Signature: Type 0, Family 6, Model 61, Stepping 4
    Flags:
        FPU (Floating-point unit on-chip)
        VME (Virtual mode extension)
        DE (Debugging extension)
        PSE (Page size extension)
        TSC (Time stamp counter)
        MSR (Model specific registers)
        PAE (Physical address extension)
        MCE (Machine check exception)
        CX8 (CMPXCHG8 instruction supported)
        APIC (On-chip APIC hardware supported)
        SEP (Fast system call)
        MTRR (Memory type range registers)
        PGE (Page global enable)
        MCA (Machine check architecture)
        CMOV (Conditional move instruction supported)
        PAT (Page attribute table)
        PSE-36 (36-bit page size extension)
        CLFSH (CLFLUSH instruction supported)
        DS (Debug store)
        ACPI (ACPI supported)
        MMX (MMX technology supported)
        FXSR (FXSAVE and FXSTOR instructions supported)
        SSE (Streaming SIMD extensions)
        SSE2 (Streaming SIMD extensions 2)
        SS (Self-snoop)
        HTT (Multi-threading)
        TM (Thermal monitor supported)
        PBE (Pending break enabled)
    Version: Intel(R) Core(TM) i7-5650U CPU @ 2.20GHz
    Voltage: 1.0 V
    External Clock: 25 MHz
    Max Speed: 2200 MHz
    Current Speed: 3100 MHz
    Status: Populated, Enabled
    Upgrade: <OUT OF SPEC>
    L1 Cache Handle: 0x0001
    L2 Cache Handle: 0x0002
    L3 Cache Handle: 0x0003
    Serial Number:  
    Asset Tag:  
    Part Number:  
    Core Count: 2
    Core Enabled: 2
    Thread Count: 4
    Characteristics:
        64-bit capable
        Multi-Core
        Hardware Thread
        Execute Protection
        Enhanced Virtualization
        Power/Performance Control

Handle 0x0005, DMI type 0, 24 bytes
BIOS Information
    Vendor: Apple Inc.
    Version: MBA71.88Z.0166.B00.1502131457
    Release Date: 02/13/2015
    ROM Size: 8192 kB
    Characteristics:
        PCI is supported
        BIOS is upgradeable
        BIOS shadowing is allowed
        Boot from CD is supported
        Selectable boot is supported
        ACPI is supported
        Smart battery is supported
        Function key-initiated network boot is supported
        UEFI is supported
    BIOS Revision: 0.1

Handle 0x0006, DMI type 1, 27 bytes
System Information
    Manufacturer: Apple Inc.
    Product Name: MacBookAir7,2
    Version: 1.0
    Serial Number: C1MPF52YG944
    UUID: 25EF0280-EC82-42B0-8FB6-10ADCCC67C02
    Wake-up Type: Power Switch
    SKU Number: System SKU#
    Family: Mac

Handle 0x0007, DMI type 2, 17 bytes
Base Board Information
    Manufacturer: Apple Inc.
    Product Name: Mac-937CB26E2E02BB01
    Version: MacBookAir7,2
    Serial Number: C07511704VSG92GA1
    Asset Tag: Base Board Asset Tag#
    Features:
        Board is a hosting board
    Location In Chassis: Part Component
    Chassis Handle: 0x0008
    Type: Motherboard
    Contained Object Handles: 0

Handle 0x0008, DMI type 3, 24 bytes
Chassis Information
    Manufacturer: Apple Inc.
    Type: Laptop
    Lock: Not Present
    Version: Mac-937CB26E2E02BB01
    Serial Number: C1MPF52YG944
    Asset Tag: Chassis Board Asset Tag#
    Boot-up State: Safe
    Power Supply State: Safe
    Thermal State: Safe
    Security Status: None
    OEM Information: 0x00000000
    Height: Unspecified
    Number Of Power Cords: Unspecified
    Contained Elements: 0
    SKU Number: Not Specified

Handle 0x0009, DMI type 8, 9 bytes
Port Connector Information
    Internal Reference Designator: Not Specified
    Internal Connector Type: None
    External Reference Designator: USB0
    External Connector Type: Access Bus (USB)
    Port Type: USB

Handle 0x000A, DMI type 8, 9 bytes
Port Connector Information
    Internal Reference Designator: Not Specified
    Internal Connector Type: None
    External Reference Designator: USB1
    External Connector Type: Access Bus (USB)
    Port Type: USB

Handle 0x000B, DMI type 8, 9 bytes
Port Connector Information
    Internal Reference Designator: Not Specified
    Internal Connector Type: None
    External Reference Designator: Audio Line In
    External Connector Type: Mini Jack (headphones)
    Port Type: Audio Port

Handle 0x000C, DMI type 8, 9 bytes
Port Connector Information
    Internal Reference Designator: Not Specified
    Internal Connector Type: None
    External Reference Designator: Thunderbolt
    External Connector Type: None
    Port Type: Other

Handle 0x000D, DMI type 8, 9 bytes
Port Connector Information
    Internal Reference Designator: Microphone
    Internal Connector Type: Other
    External Reference Designator: Not Specified
    External Connector Type: None
    Port Type: None

Handle 0x000E, DMI type 8, 9 bytes
Port Connector Information
    Internal Reference Designator: Speaker
    Internal Connector Type: Other
    External Reference Designator: Not Specified
    External Connector Type: None
    Port Type: None

Handle 0x000F, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: Integrated Video Controller
    Type: Video
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:00:00.0

Handle 0x0010, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: Azalia Audio Codec
    Type: Sound
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:00:00.0

Handle 0x0011, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: SATA
    Type: SATA Controller
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:00:00.0

Handle 0x0012, DMI type 13, 22 bytes
BIOS Language Information
    Language Description Format: Abbreviated
    Installable Languages: 1
        en
    Currently Installed Language: en

Handle 0x0013, DMI type 22, 26 bytes
Portable Battery
    Location: Not Specified
    Manufacturer: Not Specified
    Name: Not Specified
    Design Capacity: Unknown
    Design Voltage: Unknown
    SBDS Version: Not Specified
    Maximum Error: 0%
    SBDS Serial Number: 0000
    SBDS Manufacture Date: 1980-00-00
    SBDS Chemistry: Not Specified
    OEM-specific Information: 0x00000000

Handle 0x0014, DMI type 32, 11 bytes
System Boot Information
    Status: No errors detected

Handle 0x0015, DMI type 131, 6 bytes
OEM-specific Type
    Header and Data:
        83 06 15 00 06 07

Handle 0x0016, DMI type 133, 12 bytes
OEM-specific Type
    Header and Data:
        85 0C 16 00 02 00 00 00 00 00 00 00

Handle 0x0017, DMI type 128, 88 bytes
OEM-specific Type
    Header and Data:
        80 58 17 00 03 00 00 00 36 F5 03 FC 3F FF 03 FC
        02 00 03 00 00 00 00 00 00 00 99 FF FF FF AF FF
        00 00 B0 FF FF FF D4 FF 00 00 D7 FF FF FF D9 FF
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00

Handle 0x0018, DMI type 134, 20 bytes
OEM-specific Type
    Header and Data:
        86 14 18 00 32 2E 32 37 46 30 31 00 00 00 00 00
        00 00 00 00

Handle 0x0019, DMI type 16, 23 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: None
    Maximum Capacity: 8 GB
    Error Information Handle: Not Provided
    Number Of Devices: 2

Handle 0x001A, DMI type 17, 34 bytes
Memory Device
    Array Handle: 0x0019
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 4096 MB
    Form Factor: SODIMM
    Set: None
    Locator: DIMM0
    Bank Locator: BANK 0
    Type: DDR3
    Type Detail: Synchronous
    Speed: 1600 MHz
    Manufacturer: 0x80AD
    Serial Number: 0x00000000
    Asset Tag: Not Specified
    Part Number: 0x483943434E4E4E384A544D4C41522D4E544D
    Rank: Unknown
    Configured Clock Speed: 1600 MHz

Handle 0x001B, DMI type 130, 186 bytes
OEM-specific Type
    Header and Data:
        82 BA 1B 00 1A 00 00 00 B0 00 91 20 F1 03 04 12
        05 0A 03 11 01 08 0A 00 00 01 78 78 90 50 90 11
        50 E0 10 04 3C 3C 01 90 00 00 00 00 00 00 00 00
        00 A8 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80
        AD 01 00 00 00 00 00 00 57 FB 48 39 43 43 4E 4E
        4E 38 4A 54 4D 4C 41 52 2D 4E 54 4D 00 00 80 AD
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00

Handle 0x001C, DMI type 17, 34 bytes
Memory Device
    Array Handle: 0x0019
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 4096 MB
    Form Factor: SODIMM
    Set: None
    Locator: DIMM0
    Bank Locator: BANK 1
    Type: DDR3
    Type Detail: Synchronous
    Speed: 1600 MHz
    Manufacturer: 0x80AD
    Serial Number: 0x00000000
    Asset Tag: Not Specified
    Part Number: 0x483943434E4E4E384A544D4C41522D4E544D
    Rank: Unknown
    Configured Clock Speed: 1600 MHz

Handle 0x001D, DMI type 130, 186 bytes
OEM-specific Type
    Header and Data:
        82 BA 1D 00 1C 00 00 00 B0 00 91 20 F1 03 04 12
        05 0A 03 11 01 08 0A 00 00 01 78 78 90 50 90 11
        50 E0 10 04 3C 3C 01 90 00 00 00 00 00 00 00 00
        00 A8 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80
        AD 01 00 00 00 00 00 00 57 FB 48 39 43 43 4E 4E
        4E 38 4A 54 4D 4C 41 52 2D 4E 54 4D 00 00 80 AD
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00

Handle 0x001E, DMI type 19, 31 bytes
Memory Array Mapped Address
    Starting Address: 0x0000000000000000k
    Ending Address: 0x00000001FFFFFFFFk
    Range Size: 8 GB
    Physical Array Handle: 0x0019
    Partition Width: 0

Handle 0xFEFF, DMI type 127, 4 bytes
End Of Table

# uname -a
Linux aero 3.10.0-229.1.2.el7.x86_64 #1 SMP Fri Mar 6 17:12:08 EST 2015 x86_64 x86_64 x86_64 GNU/Linux

# lsusb
Bus 001 Device 002: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 001 Device 003: ID 05ac:0291 Apple, Inc. 
Bus 002 Device 002: ID 05ac:8406 Apple, Inc. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 05ac:828f Apple, Inc. 

# lspci
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1c.1 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #2 (rev e3)
00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 (rev e3)
00:1c.5 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #6 (rev e3)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03)
02:00.0 Multimedia controller: Broadcom Corporation 720p FaceTime HD Camera
03:00.0 Network controller: Broadcom Corporation BCM4360 802.11ac Wireless Network Adapter (rev 03)
04:00.0 SATA controller: Samsung Electronics Co Ltd Device a801 (rev 01)

# efivar --list
605dab50-e046-4300-abb6-3dd810dd8b23-MokListRT
8be4df61-93ca-11d2-aa0d-00e098032b8c-BootCurrent
8be4df61-93ca-11d2-aa0d-00e098032b8c-ErrOutDev
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConOutDev
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-gfx-saved-config-restore-status
8be4df61-93ca-11d2-aa0d-00e098032b8c-LangCodes
7c436110-ab2a-4bbb-a880-fe41995c9f82-BootCampProcessorPstates
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-SSN
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-GR_CAUSE
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-FirmwareFeatures
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-FirmwareFeaturesMask
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-HW_ICT
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-HW_MLB
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-MLB
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-HW_ROM
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-ROM
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-HW_BID
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-HardwareBootMode
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-BBIF
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConOut
eb704011-1402-11d3-8e77-00a0c969723b-MTC
7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolume
36c28ab5-6566-4c50-9ebd-cbb920f83843-current-network
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-current-network
7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolumeDB
7c436110-ab2a-4bbb-a880-fe41995c9f82-boot-gamma
7c436110-ab2a-4bbb-a880-fe41995c9f82-backlight-level
8be4df61-93ca-11d2-aa0d-00e098032b8c-BootOrder
8be4df61-93ca-11d2-aa0d-00e098032b8c-Boot0001
8be4df61-93ca-11d2-aa0d-00e098032b8c-Boot0000
4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14-AAPL,PathProperties0000
8d63d4fe-bd3c-4aad-881d-86fd974bc1df-last-oslogin-ident
36c28ab5-6566-4c50-9ebd-cbb920f83843-preferred-count
36c28ab5-6566-4c50-9ebd-cbb920f83843-preferred-networks
7c436110-ab2a-4bbb-a880-fe41995c9f82-fmm-computer-name
7c436110-ab2a-4bbb-a880-fe41995c9f82-LocationServicesEnabled
7c436110-ab2a-4bbb-a880-fe41995c9f82-efi-boot-device
7c436110-ab2a-4bbb-a880-fe41995c9f82-efi-boot-device-data
8be4df61-93ca-11d2-aa0d-00e098032b8c-Boot0080
af9ffd67-ec10-488a-9dfc-6cbf5ee22c2e-AcpiGlobalVariable
7c436110-ab2a-4bbb-a880-fe41995c9f82-bluetoothActiveControllerInfo
7c436110-ab2a-4bbb-a880-fe41995c9f82-bluetoothInternalControllerInfo
8be4df61-93ca-11d2-aa0d-00e098032b8c-fpf_provisioned
8be4df61-93ca-11d2-aa0d-00e098032b8c-epid_provisioned
8be4df61-93ca-11d2-aa0d-00e098032b8c-BootFFFF
8be4df61-93ca-11d2-aa0d-00e098032b8c-Lang
7c436110-ab2a-4bbb-a880-fe41995c9f82-ALS_Data
8be4df61-93ca-11d2-aa0d-00e098032b8c-MemoryConfih
8be4df61-93ca-11d2-aa0d-00e098032b8c-MemoryConfig
8be4df61-93ca-11d2-aa0d-00e098032b8c-Timeout
05299c28-3953-4a5f-b7d8-f6c6a7150b2a-SetupDefaults
4dfbbaab-1392-4fde-abb8-c41cc5ad7d5d-Setup

lshw added on 2015-12-01

# lshw

aero
    description: Laptop
    product: MacBookAir7,2 (System SKU#)
    vendor: Apple Inc.
    version: 1.0
    serial: C1MPF52YG944
    width: 64 bits
    capabilities: smbios-2.7 dmi-2.7 vsyscall32
    configuration: boot=normal chassis=laptop family=Mac sku=System SKU# uuid=8002EF25-82EC-B042-8FB6-10ADCCC67C02
  *-core
       description: Motherboard
       product: Mac-937CB26E2E02BB01
       vendor: Apple Inc.
       physical id: 0
       version: MacBookAir7,2
       serial: C07511704VSG92GA1
       slot: Part Component
     *-cache:0
          description: L1 cache
          physical id: 0
          slot: L1 Cache
          size: 32KiB
          capacity: 32KiB
          capabilities: synchronous internal write-back data
     *-cache:1
          description: L1 cache
          physical id: 1
          slot: L1 Cache
          size: 32KiB
          capacity: 32KiB
          capabilities: synchronous internal write-back instruction
     *-cache:2
          description: L2 cache
          physical id: 2
          slot: L2 Cache
          size: 256KiB
          capacity: 256KiB
          capabilities: synchronous internal write-back unified
     *-cache:3
          description: L3 cache
          physical id: 3
          slot: L3 Cache
          size: 4MiB
          capacity: 4MiB
          capabilities: synchronous internal write-back unified
     *-cpu
          description: CPU
          product: Core i7
          vendor: Intel Corp.
          physical id: 4
          bus info: cpu@0
          version: Intel(R) Core(TM) i7-5650U CPU @ 2.20GHz
          slot: U3E1
          size: 3100MHz
          capacity: 3200MHz
          width: 64 bits
          clock: 25MHz
          capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt cpufreq
          configuration: cores=2 enabledcores=2 threads=4
     *-firmware
          description: BIOS
          vendor: Apple Inc.
          physical id: 5
          version: MBA71.88Z.0166.B00.1502131457
          date: 02/13/2015
          size: 1MiB
          capacity: 8128KiB
          capabilities: pci upgrade shadowing cdboot bootselect acpi smartbattery netboot uefi
     *-memory
          description: System Memory
          physical id: 19
          slot: System board or motherboard
          size: 8GiB
        *-bank:0
             description: SODIMM DDR3 Synchronous 1600 MHz (0,6 ns)
             product: H9CCNNN8JTMLAR-NTM
             vendor: Hynix Semiconductor (Hyundai Electronics)
             physical id: 0
             serial: 0x00000000
             slot: DIMM0
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
        *-bank:1
             description: SODIMM DDR3 Synchronous 1600 MHz (0,6 ns)
             product: H9CCNNN8JTMLAR-NTM
             vendor: Hynix Semiconductor (Hyundai Electronics)
             physical id: 1
             serial: 0x00000000
             slot: DIMM0
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
     *-pci
          description: Host bridge
          product: Broadwell-U Host Bridge -OPI
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 09
          width: 32 bits
          clock: 33MHz
          configuration: driver=bdw_uncore
          resources: irq:0
        *-display
             description: VGA compatible controller
             product: Broadwell-U Integrated Graphics
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 09
             width: 64 bits
             clock: 33MHz
             capabilities: msi pm vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:56 memory:c0000000-c0ffffff memory:b0000000-bfffffff ioport:3000(size=64)
        *-multimedia:0
             description: Audio device
             product: Broadwell-U Audio Controller
             vendor: Intel Corporation
             physical id: 3
             bus info: pci@0000:00:03.0
             version: 09
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress bus_master cap_list
             configuration: driver=snd_hda_intel latency=0
             resources: irq:57 memory:c1610000-c1613fff
        *-usb
             description: USB controller
             product: Wildcat Point-LP USB xHCI Controller
             vendor: Intel Corporation
             physical id: 14
             bus info: pci@0000:00:14.0
             version: 03
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi xhci bus_master cap_list
             configuration: driver=xhci_hcd latency=0
             resources: irq:47 memory:c1600000-c160ffff
           *-usbhost:0
                product: xHCI Host Controller
                vendor: Linux 3.10.0-327.el7.x86_64 xhci-hcd
                physical id: 0
                bus info: usb@2
                logical name: usb2
                version: 3.10
                capabilities: usb-3.00
                configuration: driver=hub slots=4 speed=5000Mbit/s
              *-usb
                   description: Mass storage device
                   product: Card Reader
                   vendor: Apple
                   physical id: 3
                   bus info: usb@2:3
                   logical name: scsi0
                   version: 8.20
                   serial: 000000000820
                   capabilities: usb-3.00 scsi emulated scsi-host
                   configuration: driver=usb-storage maxpower=896mA speed=5000Mbit/s
                 *-disk
                      description: SCSI Disk
                      product: SD Card Reader
                      vendor: APPLE
                      physical id: 0.0.0
                      bus info: scsi@0:0.0.0
                      logical name: /dev/sdb
                      version: 3.00
                      serial: 000000000820
                      capabilities: removable
                      configuration: ansiversion=6 logicalsectorsize=512 sectorsize=512
                    *-medium
                         physical id: 0
                         logical name: /dev/sdb
           *-usbhost:1
                product: xHCI Host Controller
                vendor: Linux 3.10.0-327.el7.x86_64 xhci-hcd
                physical id: 1
                bus info: usb@1
                logical name: usb1
                version: 3.10
                capabilities: usb-2.00
                configuration: driver=hub slots=11 speed=480Mbit/s
              *-usb:0
                   description: USB hub
                   product: USB2.0 Hub
                   vendor: Genesys Logic, Inc.
                   physical id: 2
                   bus info: usb@1:2
                   version: 9.01
                   capabilities: usb-2.00
                   configuration: driver=hub maxpower=100mA slots=4 speed=480Mbit/s
                 *-usb:0
                      description: Mouse
                      product: USB Optical Mouse
                      vendor: Logitech
                      physical id: 2
                      bus info: usb@1:2.2
                      version: 63.00
                      capabilities: usb-2.00
                      configuration: driver=usbhid maxpower=100mA speed=1Mbit/s
                 *-usb:1
                      description: Keyboard
                      product: USB Keyboard
                      vendor: Logitech
                      physical id: 3
                      bus info: usb@1:2.3
                      version: 66.00
                      capabilities: usb-1.10
                      configuration: driver=usbhid maxpower=90mA speed=1Mbit/s
              *-usb:1
                   description: USB hub
                   product: BRCM20702 Hub
                   vendor: Apple Inc.
                   physical id: 3
                   bus info: usb@1:3
                   version: 1.00
                   capabilities: usb-2.00
                   configuration: driver=hub maxpower=94mA slots=3 speed=12Mbit/s
                 *-usb
                      description: Bluetooth wireless interface
                      product: Bluetooth USB Host Controller
                      vendor: Apple Inc.
                      physical id: 3
                      bus info: usb@1:3.3
                      version: 1.01
                      capabilities: usb-2.00 bluetooth
                      configuration: driver=btusb speed=12Mbit/s
              *-usb:2
                   description: Human interface device
                   product: Apple Internal Keyboard / Trackpad
                   vendor: Apple Inc.
                   physical id: 5
                   bus info: usb@1:5
                   version: 1.71
                   serial: D3H5074FL6ZF94RAQ3D
                   capabilities: usb-2.00
                   configuration: driver=bcm5974 maxpower=500mA speed=12Mbit/s
        *-communication
             description: Communication controller
             product: Wildcat Point-LP MEI Controller #1
             vendor: Intel Corporation
             physical id: 16
             bus info: pci@0000:00:16.0
             version: 03
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list
             configuration: driver=mei_me latency=0
             resources: irq:58 memory:c161b100-c161b11f
        *-multimedia:1
             description: Audio device
             product: Wildcat Point-LP High Definition Audio Controller
             vendor: Intel Corporation
             physical id: 1b
             bus info: pci@0000:00:1b.0
             version: 03
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list
             configuration: driver=snd_hda_intel latency=64
             resources: irq:59 memory:c1614000-c1617fff
        *-pci:0
             description: PCI bridge
             product: Wildcat Point-LP PCI Express Root Port #1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: e3
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:42
        *-pci:1
             description: PCI bridge
             product: Wildcat Point-LP PCI Express Root Port #2
             vendor: Intel Corporation
             physical id: 1c.1
             bus info: pci@0000:00:1c.1
             version: e3
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:43 memory:c1400000-c15fffff ioport:a0000000(size=268435456)
           *-multimedia UNCLAIMED
                description: Multimedia controller
                product: 720p FaceTime HD Camera
                vendor: Broadcom Corporation
                physical id: 0
                bus info: pci@0000:02:00.0
                version: 00
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list
                configuration: latency=0
                resources: memory:c1500000-c150ffff memory:a0000000-afffffff memory:c1400000-c14fffff
        *-pci:2
             description: PCI bridge
             product: Wildcat Point-LP PCI Express Root Port #3
             vendor: Intel Corporation
             physical id: 1c.2
             bus info: pci@0000:00:1c.2
             version: e3
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:44 memory:c1000000-c12fffff
           *-network
                description: Wireless interface
                product: BCM4360 802.11ac Wireless Network Adapter
                vendor: Broadcom Corporation
                physical id: 0
                bus info: pci@0000:03:00.0
                logical name: wlp3s0
                version: 03
                serial: 34:36:3b:86:04:e2
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=wl0 driverversion=6.30.223.248 (r487574) ip=192.168.0.106 latency=0 multicast=yes wireless=IEEE 802.11abg
                resources: irq:18 memory:c1200000-c1207fff memory:c1000000-c11fffff
        *-pci:3
             description: PCI bridge
             product: Wildcat Point-LP PCI Express Root Port #5
             vendor: Intel Corporation
             physical id: 1c.4
             bus info: pci@0000:00:1c.4
             version: e3
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:45 ioport:4000(size=12288) memory:c1700000-cd7fffff ioport:cd800000(size=201326592)
        *-pci:4
             description: PCI bridge
             product: Wildcat Point-LP PCI Express Root Port #6
             vendor: Intel Corporation
             physical id: 1c.5
             bus info: pci@0000:00:1c.5
             version: e3
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:46 memory:c1300000-c13fffff
           *-storage
                description: SATA controller
                product: Samsung Electronics Co Ltd
                vendor: Samsung Electronics Co Ltd
                physical id: 0
                bus info: pci@0000:04:00.0
                version: 01
                width: 32 bits
                clock: 33MHz
                capabilities: storage pm msi pciexpress ahci_1.0 bus_master cap_list
                configuration: driver=ahci latency=0
                resources: irq:48 memory:c1300000-c1301fff
        *-isa
             description: ISA bridge
             product: Wildcat Point-LP LPC Controller
             vendor: Intel Corporation
             physical id: 1f
             bus info: pci@0000:00:1f.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master cap_list
             configuration: driver=lpc_ich latency=0
             resources: irq:0
        *-serial UNCLAIMED
             description: SMBus
             product: Wildcat Point-LP SMBus Controller
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 03
             width: 64 bits
             clock: 33MHz
             configuration: latency=0
             resources: memory:c161b000-c161b0ff ioport:efa0(size=32)
        *-generic UNCLAIMED
             description: Signal processing controller
             product: Wildcat Point-LP Thermal Management Controller
             vendor: Intel Corporation
             physical id: 1f.6
             bus info: pci@0000:00:1f.6
             version: 03
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list
             configuration: latency=0
             resources: memory:c1618000-c1618fff
     *-scsi
          physical id: 6
          logical name: scsi1
          capabilities: emulated
        *-disk
             description: ATA Disk
             product: APPLE SSD SM0256
             physical id: 0.0.0
             bus info: scsi@1:0.0.0
             logical name: /dev/sda
             version: JA0Q
             serial: S1W2NYAG331512
             size: 233GiB (251GB)
             capabilities: gpt-1.00 partitioned partitioned:gpt
             configuration: ansiversion=5 guid=4025fdbc-1c2d-45f7-864a-f87804b249da logicalsectorsize=512 sectorsize=4096
           *-volume:0
                description: Windows FAT volume
                vendor: mkfs.fat
                physical id: 1
                bus info: scsi@1:0.0.0,1
                logical name: /dev/sda1
                logical name: /boot/efi
                version: FAT16
                serial: 7eac-bc8f
                size: 199MiB
                capacity: 199MiB
                capabilities: boot fat initialized
                configuration: FATs=2 filesystem=fat mount.fstype=vfat mount.options=rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=winnt,errors=remount-ro name=EFI System Partition state=mounted
           *-volume:1
                description: data partition
                vendor: Windows
                physical id: 2
                bus info: scsi@1:0.0.0,2
                logical name: /dev/sda2
                logical name: /boot
                serial: 9477ed42-e463-49a1-9bbe-991cc1bff83e
                capacity: 499MiB
                configuration: mount.fstype=xfs mount.options=rw,seclabel,relatime,attr2,inode64,noquota state=mounted
           *-volume:2
                description: data partition
                vendor: Windows
                physical id: 3
                bus info: scsi@1:0.0.0,3
                logical name: /dev/sda3
                serial: 04b082aa-fb17-4f2a-8bc9-32bce650c819
                size: 147GiB
                capacity: 147GiB
                width: 512 bits
                capabilities: encrypted luks initialized
                configuration: bits=512 cipher=aes filesystem=luks hash=sha1 mode=xts-plain64 version=1
  *-battery
       physical id: 1
  *-network DISABLED
       description: Ethernet interface
       physical id: 2
       logical name: virbr0-nic
       serial: 52:54:00:e6:cc:48
       size: 10Mbit/s
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s

Posted by Alexander Todorov on Sun 26 April 2015

There are comments.

How to Configure targetcli to Listen on IPv4 and IPv6

In order to configure targetcli to listen on both IPv4 and IPv6 one has to delete the default IPv4 portal configuration and replace it with IPv6 instead.

# targetcli 
/>
/> cd iscsi/iqn.2015-04.com.example:target1/tpg1/portals
/iscsi/iqn.20.../tpg1/portals> ls
o- portals ............................................................................................................ [Portals: 1]
  o- 0.0.0.0:3260 ............................................................................................................. [OK]
/iscsi/iqn.20.../tpg1/portals> delete 0.0.0.0 3260
Deleted network portal 0.0.0.0:3260
/iscsi/iqn.20.../tpg1/portals> create ::0
Using default IP port 3260
Created network portal ::0:3260.
/iscsi/iqn.20.../tpg1/portals> ls
o- portals ............................................................................................................ [Portals: 1]
  o- [::0]:3260 ............................................................................................................... [OK]
/iscsi/iqn.20.../tpg1/portals> exit

# netstat -antp | grep 3260
tcp6       0      0 :::3260                 :::*                    LISTEN

It appears the target is listening only on IPv6 but in fact it will also accept connections over IPv4. I've tried it.

This is a bit counter intuitive, however if you try adding the IPv6 address without removing the default IPv4 one targetcli will throw an error:

/iscsi/iqn.20.../tpg1/portals> create ::0
Using default IP port 3260
Could not create NetworkPortal in configFS.
/>

For more information about targetcli usage see my previous post How to Configure iSCSI Target on Red Hat Enterprise Linux 7.

Posted by Alexander Todorov on Wed 08 April 2015

There are comments.

Screen Magnifier and Smart Phone!

Hey guys, I want to replace my laptop for a smartphone. There's the issue with a desk working environment and one solution is to buy an external display The other one is to use a screen magnifier as shown on the picture. Mobile Screen Magnifier

Ultimately it should be possible to use any 3x Fresnel lens magnifier and make your 5" phone display into a 15" laptop size one, which is perfect for me! The magnifiers used for reading, like this one are cheap and portable but don't look very well around the edges.

None of the phone screen magnifiers on Amazon ships to my country so I don't have any experience with them, although they appear to be exactly what I need. If anyone has such a device at hand I'd love to hear how well this works for you. Please comment below.

Posted by Alexander Todorov on Sun 04 May 2014

There are comments.

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