[Bug 210369] New: amdgpu fails to resume from suspend

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https://bugzilla.kernel.org/show_bug.cgi?id=210369

            Bug ID: 210369
           Summary: amdgpu fails to resume from suspend
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.9.10-050910-generic #202011221708
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
          Reporter: sevenever@xxxxxxxxx
        Regression: No

Created attachment 293817
  --> https://bugzilla.kernel.org/attachment.cgi?id=293817&action=edit
syslog

Computer fails to resume from suspend.
>From the logs it looks like AMDGPU fails to resume.

It is a thinkpad T14 AMD APU R7 4750U, before suspend it is connected to an
external display via USB-C to miniDP adapter, after resuming the external
display is not light up.

repeated logs like below in syslog:
Nov 26 13:21:46 FengsTP kernel: [ 3977.841180] amdgpu 0000:07:00.0: amdgpu:
[gfxhub0] retry page fault (src_id:0 ring:0 vmid:6 pasid:32769, for process
Xorg pid 1831 thread Xorg:cs0 pid 1833)
Nov 26 13:21:46 FengsTP kernel: [ 3977.841182] amdgpu 0000:07:00.0: amdgpu:  
in page starting at address 0x000080010a004000 from client 27
Nov 26 13:21:46 FengsTP kernel: [ 3977.841184] amdgpu 0000:07:00.0: amdgpu:
VM_L2_PROTECTION_FAULT_STATUS:0x00601031
Nov 26 13:21:46 FengsTP kernel: [ 3977.841186] amdgpu 0000:07:00.0: amdgpu:    
 Faulty UTCL2 client ID: 0x8
Nov 26 13:21:46 FengsTP kernel: [ 3977.841187] amdgpu 0000:07:00.0: amdgpu:    
 MORE_FAULTS: 0x1
Nov 26 13:21:46 FengsTP kernel: [ 3977.841189] amdgpu 0000:07:00.0: amdgpu:    
 WALKER_ERROR: 0x0
Nov 26 13:21:46 FengsTP kernel: [ 3977.841191] amdgpu 0000:07:00.0: amdgpu:    
 PERMISSION_FAULTS: 0x3
Nov 26 13:21:46 FengsTP kernel: [ 3977.841193] amdgpu 0000:07:00.0: amdgpu:    
 MAPPING_ERROR: 0x0
Nov 26 13:21:46 FengsTP kernel: [ 3977.841195] amdgpu 0000:07:00.0: amdgpu:    
 RW: 0x0

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