[Bug 84310] [BDW]Black screen shows while executing xrandr rotation

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84310

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Just a random:

[   60.264167] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[   60.270946] [drm:drm_dp_dpcd_access] too many retries, giving up
[   60.270947] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[   60.275600] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[   60.282323] [drm:drm_dp_dpcd_access] too many retries, giving up
[   60.282324] [drm:intel_dp_complete_link_train] *ERROR* failed to update link
training

and no further mode changes after that to reset the screen. (Failure on our
part to propagate the error and a failure to never try again.)

If it is deterministic, that would be very useful for debugging.

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