https://bugs.freedesktop.org/show_bug.cgi?id=99330

--- Comment #4 from Ernst Sjöstrand <ernstp@gmail.com> ---
Wait, actually after some DPMS and
[ 4378.466823] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock
recovery tried 5 times
[ 4378.466834] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock
recovery failed

journalctl /usr/bin/gnome-shell now show a bunch of stuff like:
jan 09 22:06:51 mammut gnome-shell[1675]: Failed to flip: Invalid argument
jan 09 22:06:52 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:52 mammut gnome-shell[1448]: Failed to apply DRM plane transform
0: Access denied 
jan 09 22:06:52 mammut gnome-shell[1448]: Failed to apply DRM plane transform
0: Access denied
jan 09 22:06:52 mammut gnome-shell[1675]: Failed to apply DRM plane transform
0: Invalid argument
jan 09 22:06:52 mammut gnome-shell[1675]: Failed to apply DRM plane transform
0: Invalid argument
jan 09 22:06:53 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:53 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:53 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:53 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:53 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:53 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:53 mammut org.gnome.Shell.desktop[1675]: Window manager warning:
Failed to read EDID of output DP-3: Filen eller katalogen finns inte
jan 09 22:06:53 mammut gnome-shell[1448]: Failed to apply DRM plane transform
0: Access denied
jan 09 22:06:53 mammut gnome-shell[1675]: Failed to apply DRM plane transform
0: Invalid argument

Still, this could just as well be a gnome-shell bug?

Does it work with an older mesa/llvm version for you?

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