ryzen 4500U cpu/igpu

upon suspend, all works fine (s3) and it sleeps perfectly.

on resume, fans and lights come on, system is accessible bia ssh but no screen
no backlight.

tons of amdgpu errors in dmesg and journalctl



amdgpu 0000:04:00.0: amdgpu: RAP: optional rap ta ucode is not available
[ 1837.760051] amdgpu 0000:04:00.0: amdgpu: SECUREDISPLAY: securedisplay ta
ucode is not available
[ 1837.760055] amdgpu 0000:04:00.0: amdgpu: SMU is resuming...
[ 1837.760102] amdgpu 0000:04:00.0: amdgpu: dpm has been disabled
[ 1837.761055] amdgpu 0000:04:00.0: amdgpu: SMU is resumed successfully!
[ 1837.762895] [drm] kiq ring mec 2 pipe 1 q 0
[ 1837.910520] amdgpu 0000:04:00.0: [drm:amdgpu_ring_test_helper [amdgpu]]
*ERROR* ring sdma0 test failed (-110)
[ 1837.910625] [drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of
IP block <sdma_v4_0> failed -110
[ 1837.910724] amdgpu 0000:04:00.0: amdgpu: GPU reset(2) failed
[ 1837.910838] amdgpu 0000:04:00.0: amdgpu: GPU reset end with ret = -110
[ 1848.081017] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered
[ 1858.321012] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered




[  293.534887] amdgpu 0000:04:00.0: amdgpu: SMU is resumed successfully!
[  293.536435] [drm] kiq ring mec 2 pipe 1 q 0
[  293.687984] amdgpu 0000:04:00.0: [drm:amdgpu_ring_test_helper [amdgpu]]
*ERROR* ring sdma0 test failed (-110)
[  293.688126] [drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of
IP block <sdma_v4_0> failed -110
[  293.688237] amdgpu 0000:04:00.0: amdgpu: GPU reset(2) failed
[  293.688294] amdgpu 0000:04:00.0: amdgpu: GPU reset end with ret = -110
[  303.888650] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered




from two different occurences.