On Tue, Dec 9, 2025 at 8:33 PM Pillai, Aurabindo <[email protected]> wrote: > > [AMD Official Use Only - AMD Internal Distribution Only] > > I see some errors unrelated to display, like: > > [ 361.423085] amdgpu 0000:03:00.0: amdgpu: ring_buffer_start = > 00000000bdad4a86; ring_buffer_end = 000000000059d4d9; write_frame = > 00000000965e67c9 > [ 361.423099] amdgpu 0000:03:00.0: amdgpu: write_frame is pointing to > address out of bounds > [ 361.423188] amdgpu 0000:03:00.0: amdgpu: ring_buffer_start = > 00000000bdad4a86; ring_buffer_end = 000000000059d4d9; write_frame = > 00000000965e67c9 > [ 361.423190] amdgpu 0000:03:00.0: amdgpu: write_frame is pointing to > address out of bounds > > and > > [ 361.519801] amdgpu 0000:03:00.0: amdgpu: device lost from bus! > [ 361.519814] amdgpu 0000:03:00.0: amdgpu: SMU: response:0xFFFFFFFF for > index:36 param:0x00000001 message:SetWorkloadMask? > [ 361.519818] amdgpu 0000:03:00.0: amdgpu: Failed to set workload mask > 0x00000001 > [ 361.519826] amdgpu 0000:03:00.0: amdgpu: (-121) failed to disable > fullscreen 3D power profile mode > > Do you have these errors with the patch reverted? > > Since the follow up patch did not work, please try partially reverting the > culprit patch (the two hunks) to help us pinpoint which one fixes the issue > for you? >
Hi Aurabindo, I have performed the partial revert tests as requested. Here are the results: Reverting ONLY link_detection.c (read hunk): The issue persists. I still get "No Signal" after replugging the HDMI cable. (Log attached: dmesg-6.18.0-cb015814f8b6-hunk-1-read.zip) Reverting ONLY link_ddc.c (write hunk): The issue is FIXED. The display works correctly and wakes up immediately after replugging the cable. (Log attached: dmesg-6.18.0-cb015814f8b6-hunk-2-write.zip) Conclusion: It seems the regression is specifically caused by the changes in drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.c (the write_scdc_data function). The change in link_detection.c appears to be unrelated to the failure on my setup. -- Best Regards, Mike Gavrilov.
<<attachment: dmesg-6.18.0-cb015814f8b6-hunk-1-read.zip>>
<<attachment: dmesg-6.18.0-cb015814f8b6-hunk-2-write.zip>>
