Will do, but i guess not before the weekend. Tonight i've did some easy 
debugging by just installing some old version (3.14-3.16) of the mainline 
kernel. It showed, that the actual bug (not being able to adjust the brightness 
level after undocking) is fixed in those versions as well, but there is some 
other strange stuff going on. After every undocking the screen is just black. I 
first thought the OS/windows manger/... crashed, but after some testing it 
showed, that the brightness level was just set to the lowest possible value 
which just meant that the display is black/dark. So with 3.14-3.16 the actual 
bug is fixed but there is some really non-user-friendly behavior with just a 
black/dark screen.
So i guess i should first bisect 3.13 against 3.14 to find the actual bug(fix)? 
And after that bisect 3.14 against 3.17 to find the bugfix for the black/dark 
screen behavior. Right?

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https://bugs.launchpad.net/bugs/1378418

Title:
  [Lenovo ThinkPad T430s] Brightness bug in kernel 3.13 when using
  Docking station

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