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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #27 from Daniel Michalik <dev at blackamp.de> ---
(In reply to Chris Wilson from comment #26)
> The kernel warning is unrelated, and I think Daniel has resolved it already.
> The freeze you experience in X is directly related to the freeze in the
> kernel. If it is the lockup I expect, it should timeout after 10s. That
> would be something to check, just wait and see if it recovers eventually.
> Also checking with drm-intel-nightly has a couple of further lockup
> reduction patches.

Hi Chris,
I did some more experiments. The lockup does not timeout after 10s. Also I
correct myself. X does not freeze, but only the 'display' does. The underlying
X session seems to be fully functional, except that I can't see any of it. Let
me explain:
I take out the laptop from the dock. The displays are autoconfigured, but
in-between some of the xrandr steps the display 'freezes', and whatever
configuration that is is shown until I reboot, no updates occur. It always
freezes in the same moment, so the frozen window configuration is always the
same, but I cannot pinpoint which was the last successful xrandr command.

Once the 'freeze' occurs the image I see does not get updated anymore, but the
mouse cursor keeps working. The machine suspends and resumes correctly. It
activates the screensaver (I can tell from the fact that the mouse is
restricted in its movements to the login box of xlock). Once I type in my
password the mouse is free to move along the entire screen again. The mouse
cursor updates depending on keypresses, e.g. if I open (blindly) something to
write it changes into a input symbol. I can type blindly type commands if I
manage to blindly open a terminal. Executing xrandr --auto does not restore the
display. I managed to restart by typing Alt+F2 and 'sudo reboot'. If I change
to a virutal terminal (Alt+Ctrl+F1) I cannot see anything there either, but the
screens update to black. I cannot recover the frozen X image through
Alt+Ctrl+F7. 
I hope this helps to shed some more light on the issue. Let me know if I should
conduct further investigations or provide additional log files. Thanks, Daniel

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