[Bug 107679] i915 display link training after suspend/resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107679

--- Comment #2 from freedesktop at delyan.me ---
Created attachment 141311
  --> https://bugs.freedesktop.org/attachment.cgi?id=141311&action=edit
dmesg from drm-tip (f1c0fce7feaa69409ec8a379fc78ef792f168d28)

drm-tip (f1c0fce7feaa69409ec8a379fc78ef792f168d28) actually does a lot worse.

I observe the following:
1) Log into the user session
2) Plug in the dock with the two displays
3) Flash to black on laptop screen
4) AFAICT one of the two displays wakes up but only shows a mouse pointer on a
black display
5) Moving the mouse pointer even a little bit renders it unresponsive (it
freezes)
6) Unplugging the dock cable doesn't recover the system

For reasons I don't understand, journalctl was unable to show me these boots
(which I had to force-power-off from), so the dmesg is from the following:
1) Log in to the user session
2) Switch to a tty
3) Start dmesg -w | tee 
4) Switch back to user session
5) Plug in dock
6) Wait a bit
7) SysRq emergency sync
8) Force power off

Hope this helps, happy to try out other things too :)

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