[Bug 107546] Screen is frozen on second connection of DP MST dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107546

--- Comment #8 from Sergey Menshikov <sergey.menshikov at gmail.com> ---
Having issue reproducing with drm-tip kernel - it hangs on dock connection,
differently. Connecting the dock with drm-tip kernel results in strange picture
on external displays (blown up section of screen, displayed in a limited square
on one of the external screens). Disconnecting the dock leaves everything
blank. Talking laptop to sleep restores laptop panel. dmesg (without debug) is
attached. Any help on what's wrong it appreciated (perhaps I built drm-tip
wrong).

On 4.15.0.30: unable to reproduce with log_buf_size option set to anything.
Will try some more.

I was able to reproduce it again without kernel options on the 4.15.0.30
kernel. While the screen is frozen, "xrandr -display :0.0 -q"  from external
ssh actually hangs until I disconnect the dock.

xrandr output with screens connected and disconnected during normal operation
is attached.

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