[systemd-bugs] [Bug 81884] [regression] save/restore screen backlight brightness fails after xorg update

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81884

--- Comment #6 from Mike C <mike.cloaked at gmail.com> ---
I have some progress now. It was suggested to try a patch to xf86-video-intel
at
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=5935c93ce77a5da09aab9b45b1a5710d681c171e.
I rebuilt xf86-video-intel with this patch and rebooted and the symptoms
persisted.

Later this evening a new set of updates was available that included kdelibs.

So after doing the pacman update that included upgraded kdelibs (4.13.3-1 ->
4.13.3-2), and then shutting down completely, and then booting from cold seems
to have resolved the issue! I checked the stored value which is at
/var/lib/systemd/backlight/pci-0000\:00\:02.0\:backlight\:intel_backlight and
it gives 937 which is correct!

I tested further by reverting the xf86-video-intel package to that in the
[core]  repo, and the problem with brightness returned. Re-installing the
amended package containing the patch
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=5935c93ce77a5da09aab9b45b1a5710d681c171e
fixes the issue again. So indeed the patch does fix the problem. Whether
additionally I needed to fully shutdown and boot from cold only, or whether the
additional update to kdelibs was crucial I don't know but with both the version
4.13.3-2 of kdelibs as well as the patched xf86-video-intel this is resolved
for me now.

Therefore I will close this bug.

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