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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Backlight settings vanish after some time"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98759">98759</a>
</td>
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<tr>
<th>Summary</th>
<td>Backlight settings vanish after some time
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Driver/intel
</td>
</tr>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
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<tr>
<th>Reporter</th>
<td>nico-freedesktop.org@schottelius.org
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=128037" name="attach_128037" title="xorg.0.0log">attachment 128037</a> <a href="attachment.cgi?id=128037&action=edit" title="xorg.0.0log">[details]</a></span>
xorg.0.0log
Running xorg on a Lenovo X1 carbon gen4 (skylake) with any recent Linux kernel
(currently 4.8.8-1-ARCH), the backlight information vanishes after some time:
Calling "xbacklight" gives an empty result:
[10:56] feder:~% xbacklight
[10:56] feder:~% xbacklight -set 100
[10:56] feder:~% echo $?
0
However when restarting xorg, it works for some time (some hours).
I first assumed it might be related to suspend, however yesterday it also
happened without a suspend in between.
X.Org X Server 1.18.4
Release Date: 2016-07-19
[ 3671.610] X Protocol Version 11, Revision 0
[ 3671.610] Build Operating System: Linux 4.5.4-1-ARCH x86_64
[ 3671.611] Current Operating System: Linux feder 4.8.8-1-ARCH #1 SMP PREEMPT
Tue Nov 15 08:25:24 CET 2016 x86_64
[ 3671.611] Kernel command line: BOOT_IMAGE=/vmlinuz-linux
root=UUID=22a059b2-d72f-4d45-8da7-c4cc22b9a620 rw
cryptdevice=/dev/nvme0n1p3:root quiet
[ 3671.611] Build Date: 19 July 2016 05:54:24PM
[10:54] feder:~% pacman -Q | grep ^xorg
xorg-appres 1.0.4-1
xorg-bdftopcf 1.0.5-1
xorg-font-util 1.3.1-1
xorg-font-utils 7.6-4
xorg-fonts-alias 1.0.3-1
xorg-fonts-encodings 1.0.4-4
xorg-fonts-misc 1.0.3-4
xorg-luit 1.1.1-2
xorg-mkfontdir 1.0.7-2
xorg-mkfontscale 1.1.2-1
xorg-server 1.18.4-1
xorg-server-common 1.18.4-1
xorg-setxkbmap 1.3.1-1
xorg-xauth 1.0.9-1
xorg-xbacklight 1.2.1-1
xorg-xdpyinfo 1.3.2-1
xorg-xev 1.2.2-1
xorg-xinit 1.3.4-4
xorg-xinput 1.6.2-1
xorg-xkbcomp 1.3.1-1
xorg-xkill 1.0.4-1
xorg-xmodmap 1.0.9-1
xorg-xrandr 1.5.0-1
xorg-xrdb 1.1.0-2
xorg-xset 1.2.3-1
xorg-xsetroot 1.1.1-2
xorg-xwd 1.0.6-1
xorg-xwininfo 1.1.3-1</pre>
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