[Bug 67454] After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67454

--- Comment #78 from Patrik Jakobsson <patrik.r.jakobsson at gmail.com> ---
I've managed to work around the issue by programming the backlight driver
directly. This is not an optimal solution but consider it a workaround for now.
I've written a driver and tested it on my MBA 6,2 but the 6,1 should work as
well. Use it at your own risk, I take no responsibility. Don't try to load this
driver unless you have a MacBook Air (mid 2013) 6,1 or 6,2.

To get it running you need to download and build the driver:

# git clone https://github.com/patjak/mba6x_bl
# cd mba6x_bl/ && make && make install

Make sure the module is loaded at boot time. E.g add "mba6x_bl" to /etc/modules
You also need to configure i915 to hand over the backlight control to mba6x_bl.
I added this to my /etc/X11/xorg.conf:

Section "Device"
        Identifier      "Intel Graphics"
        Driver          "intel"
        Option          "Backlight"     "mba6x_backlight"
EndSection

Now reboot and you should have working brightness even after suspend/resume.
Unloading the module (modprobe -r mba6x_bl) will restore the backlight to
whatever state we had when loading it.

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