https://bugs.freedesktop.org/show_bug.cgi?id=100745
--- Comment #10 from Dimitrios Liappis dimitrios.liappis@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.