Test 1: amdgpu.dcdebugmask=0x10 amdgpu.sg_display=0 All well, no observations during a full workday. Test 2: amggpu.sg_display=0 Flicker/tear is back, and a full screen freeze within 10 minutes. About the screen freeze: contrary to yesterday the laptop was now connected to a second screen. I was using both the internal laptop screen (PSR capable, theoretically), and an older external HDMI monitor (non-PSR capable presumably, if that even matters). The laptop screen froze, while the external monitor was still functioning (the mouse pointer was fixed mid-screen on the laptop, while I could move it on the external monitor). kern.log (grep amdgpu): Apr 6 09:22:59 rct14s kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-6.3.0-060300rc5-generic root=UUID=41d8f993-282a-48a5-b355-6f537a3a17ab ro quiet splash amdgpu.sg_display=0 vt.handoff=7 Apr 6 09:22:59 rct14s kernel: [ 0.004000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.3.0-060300rc5-generic root=UUID=41d8f993-282a-48a5-b355-6f537a3a17ab ro quiet splash amdgpu.sg_display=0 vt.handoff=7 Apr 6 09:22:59 rct14s kernel: [ 3.971093] [drm] amdgpu kernel modesetting enabled. Apr 6 09:22:59 rct14s kernel: [ 3.980870] amdgpu: Virtual CRAT table created for CPU Apr 6 09:22:59 rct14s kernel: [ 3.980887] amdgpu: Topology: Add CPU node Apr 6 09:22:59 rct14s kernel: [ 3.981020] amdgpu 0000:33:00.0: enabling device (0006 -> 0007) Apr 6 09:22:59 rct14s kernel: [ 3.982752] amdgpu 0000:33:00.0: amdgpu: Fetched VBIOS from VFCT Apr 6 09:22:59 rct14s kernel: [ 3.982755] amdgpu: ATOM BIOS: 113-REMBRANDT-X37 Apr 6 09:22:59 rct14s kernel: [ 3.987559] amdgpu 0000:33:00.0: vgaarb: deactivate vga console Apr 6 09:22:59 rct14s kernel: [ 3.987562] amdgpu 0000:33:00.0: amdgpu: Trusted Memory Zone (TMZ) feature disabled as experimental (default) Apr 6 09:22:59 rct14s kernel: [ 3.987566] amdgpu 0000:33:00.0: amdgpu: PCIE atomic ops is not supported Apr 6 09:22:59 rct14s kernel: [ 3.987613] amdgpu 0000:33:00.0: amdgpu: VRAM: 1024M 0x000000F400000000 - 0x000000F43FFFFFFF (1024M used) Apr 6 09:22:59 rct14s kernel: [ 3.987616] amdgpu 0000:33:00.0: amdgpu: GART: 1024M 0x0000000000000000 - 0x000000003FFFFFFF Apr 6 09:22:59 rct14s kernel: [ 3.987617] amdgpu 0000:33:00.0: amdgpu: AGP: 267419648M 0x000000F800000000 - 0x0000FFFFFFFFFFFF Apr 6 09:22:59 rct14s kernel: [ 3.988145] [drm] amdgpu: 1024M of VRAM memory ready Apr 6 09:22:59 rct14s kernel: [ 3.988148] [drm] amdgpu: 15421M of GTT memory ready. Apr 6 09:22:59 rct14s kernel: [ 3.989361] amdgpu 0000:33:00.0: amdgpu: Will use PSP to load VCN firmware Apr 6 09:22:59 rct14s kernel: [ 4.158660] amdgpu 0000:33:00.0: amdgpu: RAS: optional ras ta ucode is not available Apr 6 09:22:59 rct14s kernel: [ 4.169798] amdgpu 0000:33:00.0: amdgpu: RAP: optional rap ta ucode is not available Apr 6 09:22:59 rct14s kernel: [ 4.169805] amdgpu 0000:33:00.0: amdgpu: SECUREDISPLAY: securedisplay ta ucode is not available Apr 6 09:22:59 rct14s kernel: [ 4.171302] amdgpu 0000:33:00.0: amdgpu: SMU is initialized successfully! Apr 6 09:22:59 rct14s kernel: [ 4.194388] snd_hda_intel 0000:33:00.1: bound 0000:33:00.0 (ops amdgpu_dm_audio_component_bind_ops [amdgpu]) Apr 6 09:22:59 rct14s kernel: [ 4.306568] kfd kfd: amdgpu: Allocated 3969056 bytes on gart Apr 6 09:22:59 rct14s kernel: [ 4.306628] amdgpu: sdma_bitmap: 3 Apr 6 09:22:59 rct14s kernel: [ 4.345182] amdgpu: HMM registered 1024MB device memory Apr 6 09:22:59 rct14s kernel: [ 4.345276] amdgpu: SRAT table not found Apr 6 09:22:59 rct14s kernel: [ 4.345277] amdgpu: Virtual CRAT table created for GPU Apr 6 09:22:59 rct14s kernel: [ 4.345428] amdgpu: Topology: Add dGPU node [0x1681:0x1002] Apr 6 09:22:59 rct14s kernel: [ 4.345431] kfd kfd: amdgpu: added device 1002:1681 Apr 6 09:22:59 rct14s kernel: [ 4.345446] amdgpu 0000:33:00.0: amdgpu: SE 1, SH per SE 2, CU per SH 6, active_cu_number 12 Apr 6 09:22:59 rct14s kernel: [ 4.345578] amdgpu 0000:33:00.0: amdgpu: ring gfx_0.0.0 uses VM inv eng 0 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345580] amdgpu 0000:33:00.0: amdgpu: ring comp_1.0.0 uses VM inv eng 1 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345581] amdgpu 0000:33:00.0: amdgpu: ring comp_1.1.0 uses VM inv eng 4 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345582] amdgpu 0000:33:00.0: amdgpu: ring comp_1.2.0 uses VM inv eng 5 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345583] amdgpu 0000:33:00.0: amdgpu: ring comp_1.3.0 uses VM inv eng 6 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345584] amdgpu 0000:33:00.0: amdgpu: ring comp_1.0.1 uses VM inv eng 7 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345585] amdgpu 0000:33:00.0: amdgpu: ring comp_1.1.1 uses VM inv eng 8 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345586] amdgpu 0000:33:00.0: amdgpu: ring comp_1.2.1 uses VM inv eng 9 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345586] amdgpu 0000:33:00.0: amdgpu: ring comp_1.3.1 uses VM inv eng 10 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345587] amdgpu 0000:33:00.0: amdgpu: ring kiq_2.1.0 uses VM inv eng 11 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345588] amdgpu 0000:33:00.0: amdgpu: ring sdma0 uses VM inv eng 12 on hub 0 Apr 6 09:22:59 rct14s kernel: [ 4.345589] amdgpu 0000:33:00.0: amdgpu: ring vcn_dec_0 uses VM inv eng 0 on hub 1 Apr 6 09:22:59 rct14s kernel: [ 4.345590] amdgpu 0000:33:00.0: amdgpu: ring vcn_enc_0.0 uses VM inv eng 1 on hub 1 Apr 6 09:22:59 rct14s kernel: [ 4.345591] amdgpu 0000:33:00.0: amdgpu: ring vcn_enc_0.1 uses VM inv eng 4 on hub 1 Apr 6 09:22:59 rct14s kernel: [ 4.345592] amdgpu 0000:33:00.0: amdgpu: ring jpeg_dec uses VM inv eng 5 on hub 1 Apr 6 09:22:59 rct14s kernel: [ 4.347380] [drm] Initialized amdgpu 3.52.0 20150101 for 0000:33:00.0 on minor 0 Apr 6 09:22:59 rct14s kernel: [ 4.354489] fbcon: amdgpudrmfb (fb0) is primary device Apr 6 09:22:59 rct14s kernel: [ 4.450390] amdgpu 0000:33:00.0: [drm] fb0: amdgpudrmfb frame buffer device Apr 6 09:36:09 rct14s kernel: [ 795.213811] amdgpu 0000:33:00.0: [drm] *ERROR* [CRTC:72:crtc-0] flip_done timed out Apr 6 09:36:25 rct14s kernel: [ 810.573837] amdgpu 0000:33:00.0: [drm] *ERROR* flip_done timed out Apr 6 09:36:25 rct14s kernel: [ 810.573852] amdgpu 0000:33:00.0: [drm] *ERROR* [CRTC:72:crtc-0] commit wait timed out Apr 6 09:37:17 rct14s kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-6.3.0-060300rc5-generic root=UUID=41d8f993-282a-48a5-b355-6f537a3a17ab ro quiet splash amdgpu.sg_display=0 vt.handoff=7 Apr 6 09:37:17 rct14s kernel: [ 0.004000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.3.0-060300rc5-generic root=UUID=41d8f993-282a-48a5-b355-6f537a3a17ab ro quiet splash amdgpu.sg_display=0 vt.handoff=7 I will repeat test 2 with no external monitor connected. UPDATE: kern log added