[Bug 69251] Getting kernel WARN every time I disconnect a DisplayPort monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69251

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from Daniel Vetter <daniel at ffwll.ch> ---
Our state tracking when unplugging a DP port is a bit wreaked: First we get a
hpd event, try to retrain the link and since that fails we shut down the port.
Then userspace tries to do something else (modeset usually to shut down the
pipe) and we notice the pipe is off already.

Imo the right thing to do is that instead of disabling the port we enable it
with some failsafe link training parameters. That should also help in a few
other inconsistencies. I.e. instead of calling intel_dp_link_down we should imo
call intel_dp_set_idle_link_train.

Stéphane, can you please boot with drm.debug=0xe added to your kernel bootline,
reproduce the issue once and then attach the complete dmesg? I just want to
confirm that I didn't miss anything.

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