Created attachment 844380 [details]
dmesg failed failed resume from hibernate

Upon resume from hibernate on a Thinkpad T495 AMD Ryzen 7 PRO 3700U, the X
server is totally frozen, the laptop is not totally frozen as I can connect to
it normally with ssh. The issue I belive is on the amdgpu drm driver.

Kernel version 5.3.18-lp152.57-default

I've tested kernel 5.10.rc7-2.1.g9688120 from head and kernel
5.9.13-1.1.g3dfd18b from stable, suspend to disk works fine with both kernels.

Moreover, I've compiled the closest upstream lts kernel (v5.4.82) to the leap
kernel and it works perfectly fine. By that I was hoping to diff the changes to
identify the fix, but with no success so far.

I'm attaching dmesg after the machine resumed from hibernate, it shows the
following amdgpu related errors.

[   28.548521] amdgpu 0000:06:00.0: GPU mode1 reset failed
[   28.548709] [drm:amdgpu_device_suspend [amdgpu]] *ERROR* amdgpu asic reset
failed
[   29.216975] amdgpu 0000:06:00.0: [gfxhub] no-retry page fault (src_id:0
ring:222 vmid:1 pasid:0, for process  pid 0 thread  pid 0)
[   29.216979] amdgpu 0000:06:00.0:   in page starting at address
0x0000800000028000 from 27
[   29.216981] amdgpu 0000:06:00.0: VM_L2_PROTECTION_FAULT_STATUS:0x001009BC
[   29.227613] amdgpu: [powerplay] dpm has been enabled