[Bug 100745] amdgpu fails to wake up DisplayPort DELL monitors with 'clock recovery failed'

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100745

--- Comment #10 from Dimitrios Liappis <dimitrios.liappis at gmail.com> ---
This is a real problem for me as well, for some time now, with amdgpu (Radeon
RX560), Fedora-27, gnome-shell and Dell P2715Q monitor. It happens both on Xorg
and Wayland.

> kernel: [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* displayport link status failed
> kernel: [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock recovery failed
> kernel: [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* displayport link status failed
> kernel: [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock recovery failed

The nuisance here is this almost always crashes gnome-shell. Attached coredump
excerpt.

I used to be able to circumvent the gnome-shell crash by disabling dpms ("xset
-dpms" and/or "xset dpms force off") but this doesn't seem to help anymore.

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