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.
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