#762676 gnome-shell: docking laptop or restarting Shell while docked sets backlight to off

Package:
gnome-shell
Source:
gnome-shell
Description:
graphical shell for the GNOME desktop
Submitter:
Simon McVittie
Date:
2014-09-24 11:27:04 UTC
Severity:
normal
#762676#5
Date:
2014-09-24 10:52:09 UTC
From:
To:
I have a Lenovo Thinkpad X220 laptop with Intel graphics, a docking station
and a DisplayPort-attached monitor, in this configuration:

       /---------\
 /-----+ monitor |
 |X220 |         |
 \-----+---------/

The X220 is the primary monitor (with the menu bar), if that matters.

When I dock the X220 into the docking station or restart Shell with
Alt+F2, "r", the X220's backlight turns down to its lowest level, which
is unreadable. Workaround: turn it back up with the hotkey (Fn+Home).

When I experienced this when docking the laptop I thought it was more likely
to be a kernel or "plumbing" bug (systemd or udev or something), but I'm
filing it against gnome-shell for now, since I can also reproduce it with
Alt+F2, "r".

Any debugging advice?

    S
#762676#10
Date:
2014-09-24 11:25:07 UTC
From:
To:
Am 24.09.2014 um 12:52 schrieb Simon McVittie:

I almost have the identical setup and I can confirm this behaviour with
with an up-to-date sid.
This seems to be a recent change in behaviour/regression.
I suspected systemd v215 as possible culprit as well, but I can also
reproduce this with v208.