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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #18 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Daniel Michalik from comment #17)
> Another thing I still haven't understood. Upon undocking, DP-3, DP-4, and
> DP-5 get removed according to the log. Upon re-docking they get removed
> again, according to the log. Two comments:
> a) They shouldn't exist when re-docking?
> b) They should be added, not removed when re-docking?

It's just a bad log message. It's in the core Xorg code to handle hotplugging
of whole GPU devices and responds to any drm hotplug event and prints confusing
log messages.

The interesting thing about the log you pasted is that it dies on a modesetting
operation. I guess drm.debug=6 dmesg would be relevant as well. Another problem
is that you are using Present, which is broken across screen resizes. You could
try compiling the ddx with --disable-dri3 to see if that helps at all. But I
think dmesg is the next step towards working out the cause of the freeze.

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