[AMDGPU] DP AUX transfer fail, as of 6.14.7

[Alex Deucher]

On Mon, May 19, 2025 at 8:53 AM Mr Penguin <mr.penguin.mkv at gmail.com> wrote:
>
> Hi,
>
> I've upgraded my vanilla 6.14.6 kernel to 6.14.7, and I am now seeing "DP AUX transfer fail: 4" warnings. These don't appear to be significant, but they are definitely new. And there are definitely a LOT of them:
>
> ...
> [   26.915115] amdgpu 0000:04:00.0: amdgpu: Using BACO for runtime pm
> [   26.920868] amdgpu 0000:04:00.0: [drm] Registered 5 planes with drm panic
> [   26.926418] [drm] Initialized amdgpu 3.61.0 for 0000:04:00.0 on minor 0
> [   26.938637] fbcon: amdgpudrmfb (fb0) is primary device
> [   26.939008] [drm] pre_validate_dsc:1621 MST_DSC dsc precompute is not needed
> [   26.939522] amdgpu 0000:04:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> [   26.940222] amdgpu 0000:04:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> [   26.940921] amdgpu 0000:04:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> [   26.941667] amdgpu 0000:04:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> [   26.942419] amdgpu 0000:04:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> ...
> [   26.984445] amdgpu 0000:04:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> [   26.985183] amdgpu 0000:04:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> [   27.020491] Console: switching to colour frame buffer device 210x65
> [   27.437597] amdgpu 0000:04:00.0: [drm] fb0: amdgpudrmfb frame buffer device
> ...
>
> Should I be concerned by this? I would guess that this is a race at start-up.

You can ignore it.  There was an aux fix that went in that was a
little too verbose.  Its verbosity was reduced last week so you should
see those messages disappear in the next update.

Alex

>
> The full dmesg log is attached.
>
> Cheers,
> Chris
>