[Bug 211501] Kernel freeze when waking monitor from blanking / DPMS (AMDGPU / DC)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211501

--- Comment #2 from Jasen Borisov (borisovjasen at protonmail.com) ---
OK, it just happened again. More info:

The secondary monitor lights up, but just shows a black screen with the mouse
cursor, but the primary monitor does not. This makes me suspect that my primary
monitor is the culprit.

As before, the kernel freezes for about a minute or so in that state, and then
recovers.

The dmesg output is shorter this time:

[Feb 3 19:20] [drm] perform_link_training_with_retries: Link training attempt 1
of 4 failed
[  +0.407677] [drm] perform_link_training_with_retries: Link training attempt 2
of 4 failed
[  +0.460615] [drm] perform_link_training_with_retries: Link training attempt 3
of 4 failed
[  +0.420583] [drm] enabling link 0 failed: 15
[  +0.177390] [drm] perform_link_training_with_retries: Link training attempt 1
of 4 failed
[  +0.060044] [drm] perform_link_training_with_retries: Link training attempt 2
of 4 failed
[  +0.111304] [drm] perform_link_training_with_retries: Link training attempt 3
of 4 failed
[  +0.159993] [drm] enabling link 0 failed: 15
[Feb 3 19:21] [drm] REG_WAIT timeout 10us * 3000 tries -
dce110_stream_encoder_dp_blank line:955

There was no backtrace like last time.

BTW, note that the kernel "thinks" that ~1 second passed, based on those
timestamps, but in reality, it was about a minute.

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