[Bug 98759] Backlight settings vanish after some time

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98759

--- Comment #9 from nico-freedesktop.org at schottelius.org ---
Fun fact:

since restarting xorg yesterday, I cannot yet reproduce the problem. Neither
suspend, nor connecting / disconncting external output seem to reliable cause
the problem.

Things I have changed since the first report:

- upgraded from linux 4.8.8-1 to linux 4.8.8-2 (should not change anything,
only enabled / added the randomization flag)

- removed /etc/udev/rules.d/90-backlight.rules that I used for modesetting
driver+acpibacklight, which contained:

SUBSYSTEM=="backlight", ACTION=="add", RUN+="/bin/chgrp video
/sys/class/backlight/%k/brightness"
SUBSYSTEM=="backlight", ACTION=="add", RUN+="/bin/chmod g+w
/sys/class/backlight/%k/brightness"

I do not assume that either of both should have interfered with xorg and I am
also in the group video, as can be seen below.


[17:54] feder:~% id
uid=1000(nico) gid=1000(nico)
groups=1000(nico),14(uucp),90(network),91(video),92(audio),93(optical),98(power),100(users),150(wireshark),992(docker)

However I also remember having some days *with* backlight being present and
then vanishing - thus I'll report again, as soon as it vanishes.

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