Comment 26 for bug 1308674

Created attachment 865143
journal snippet

Description of problem:
If this happens:
1. You power on the notebook inside the docking station.
2. You log in.
3. You dock out the notebook.

Then your brightness is set to minimum (the screen is nearly unreadable) and the brightness control is broken - you can't adjust the brightness.

When you dock the notebook back in, the brightness is restored to the normal level and you can control it.

If you start your notebook outside of the docking station, this bug is not experienced at all (even if you dock in and dock out, everything works).

This is a regression with kernel-3.13.2-200.fc20.x86_64 , if I boot
kernel-3.12.9-301.fc20.x86_64 then everything works OK.

I have this confirmed on Thinkpad X220:
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09)

and also on Thinkpad T520. I guess both use Intel HD 3000?

I don't see anything useful in the logs. I attach journal snippet when I undock the notebook. You can see brightness-related systemd printouts, that's when I try to change the brightness (or some of that happens automatically during docking out).

Version-Release number of selected component (if applicable):
kernel-3.13.2-200.fc20.x86_64

How reproducible:
100%

Steps to Reproduce:
1. power on the notebook inside the docking station
2. log in
3. dock out the notebook

Actual results:
your brightness is set to minimum (the screen is nearly unreadable) and the brightness control is broken - you can't adjust the brightness