Created attachment 303547 [details] boot messages and pci info I have a new Powercolor AMD Radeon RX 6400 ITX and whenever the screen is blanked (DPMS or X blanking -- I haven't tried non-X) with gfxoff enabled, the whole system hangs (or at least network and alt-sysrq are unresponsive, though there seems to be some activity): Jan 7 01:12:29 talula kernel: [drm:amdgpu_job_timedout] *ERROR* ring gfx_0.0.0 timeout, signaled seq=23406, emitted seq=23407 Jan 7 01:12:29 talula kernel: [drm:amdgpu_job_timedout] *ERROR* Process information: process X pid 3404 thread X:cs0 pid 3412 Jan 7 01:12:29 talula kernel: amdgpu 0000:75:00.0: amdgpu: GPU reset begin! Jan 7 01:12:32 talula kernel: amdgpu 0000:75:00.0: amdgpu: SMU: I'm not done with your previous command: SMN_C2PMSG_66:0x00000029 SMN_C2PMSG_82:0x00000000 Jan 7 01:12:32 talula kernel: amdgpu 0000:75:00.0: amdgpu: Failed to disable gfxoff! Setting amdgpu_gfxoff to 0 in debugfs prevents this, and everything works correctly. I've tried this on 5.15.80 and checked I have the most recent firmware. Happy to provide any additional info or try additional diagnostics. Full boot messages and pci info for card attached.
Please search for duplicates here https://gitlab.freedesktop.org/drm/amd/-/issues and if there are none, file a bug report over there.