[Bug 110477] [5.0.7] [drm:hwss_edp_wait_for_hpd_ready [amdgpu]] *ERROR* hwss_edp_wait_for_hpd_ready: wait timed out!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110477

            Bug ID: 110477
           Summary: [5.0.7] [drm:hwss_edp_wait_for_hpd_ready [amdgpu]]
                    *ERROR* hwss_edp_wait_for_hpd_ready: wait timed out!
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: taijian at posteo.de

Created attachment 144052
  --> https://bugs.freedesktop.org/attachment.cgi?id=144052&action=edit
relevant dmesg output

On an Alienware 15R3 with hybrid graphics (Intel/AMD RX470) I get the above
error message (inter alia) in dmesg both during boot-up and whenever the dGPU
gets woken from pm-suspend. This is not breaking, per se - the dGPU will
perform it's duties normally when called upon, but takes a long time to 'go
back to sleep' when no longer needed - see the bunch of 

amdgpu: [powerplay] 
                failed to send message 148 ret is 0

spam in dmesg. But maybe this has something to do with that?

dmesg attached.

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