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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [regression] save/restore screen backlight brightness fails after xorg update"
href="https://bugs.freedesktop.org/show_bug.cgi?id=81884#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [regression] save/restore screen backlight brightness fails after xorg update"
href="https://bugs.freedesktop.org/show_bug.cgi?id=81884">bug 81884</a>
from <span class="vcard"><a class="email" href="mailto:mike.cloaked@gmail.com" title="Mike C <mike.cloaked@gmail.com>"> <span class="fn">Mike C</span></a>
</span></b>
<pre>I have some progress now. It was suggested to try a patch to xf86-video-intel
at
<a href="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=5935c93ce77a5da09aab9b45b1a5710d681c171e">http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=5935c93ce77a5da09aab9b45b1a5710d681c171e</a>.
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
<a href="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=5935c93ce77a5da09aab9b45b1a5710d681c171e">http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=5935c93ce77a5da09aab9b45b1a5710d681c171e</a>
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.</pre>
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