[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 #24 from Sergey Menshikov <sergey.menshikov at gmail.com> ---
Apologies for the delay - the issue became very rare.

I reproduced it with kernel 4.15.0.36 with options drm.debug=0x1e
log_buf_len=4M and dmesg is attached.

The key this time was to boot with dock attached, disconnect and reconnect 2
times. I can repro this reliably every time at the moment.

To reproduce with drm-tip kernel I need more guidance (unable to connect the
dock at the first place):

> 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.

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