[Bug 84718] DP MST: re-docking messes up displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84718

--- Comment #3 from Daniel Michalik <dev at blackamp.de> ---
Created attachment 107435
  --> https://bugs.freedesktop.org/attachment.cgi?id=107435&action=edit
Xorg.log with udev

Chris, thank you for your quick answer. I installed libudev-dev and
reconfigured + compiled + installed the video driver. Undocking now causes the
laptop screen to show some part of the entire picture, and seemingly not
reacting to my keypresses. Re-docking brings back the screens, but X does not
react to inputs, no mouse cursor visible. xlog attached. 
The messages:
[    40.992] (II) intel(0): Disabled output DP2-1 upon undock
[    58.881] (II) intel(0): Enabled output DP2-1 upon re-dock seem to be new
and seemingly make sense. 

DP-5 (which does not exist according to xrandr) gets removed upon undock:
[    39.579] removing GPU device
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-5 (null)
Same for DP-4 and DP-3, a while later. 

At 58 seconds I re-dock, and DP-3 and DP-4 are getting *removed* a second time
now, rather than readded. 

[    59.168] (II) intel(0): switch to mode 1920x1080 at 60.0 on DP2-1 using pipe
1, position (0, 0), rotation normal, reflection none
seems to be the right thing to do, however my X remains unusable in this
moment. The log ends.

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