APPLIED: [PATCH 0/1][SRU][Jammy] dmesg flooded with errors: amdgpu: DP AUX transfer fail:4

[Mehmet Basaran]

Applied to jammy:linux master-next branch. Thanks.

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You-Sheng Yang <vicamo.yang at canonical.com> writes:

> BugLink: https://bugs.launchpad.net/bugs/2115238
>
> [ Impact ]
>
> v6.15-rc6 commit 65924ec69b292 ("drm/amd/display: Fix wrong handling for
> AUX_DEFER case") added a `drm_info()` call to notify a failed
> transaction, and that may flood kernel dmesg buffer. This was then fixed
> by another v6.15-rc7 commit d33724ffb743d ("drm/amd/display: Avoid
> flooding unnecessary info messages").
>
> The former was also backported to v6.14.7, v6.12.29, v6.6.91, v6.1.139,
> v5.15.183.
>
> The later to v6.14.8, v6.12.30, v6.6.92, v6.1.140.
>
> - linux-6.14/plucky version 6.14.0-24.24 has v6.14.6, not yet affected,
> - linux-6.11/oracular master-next has v6.6.88, v6.12.25, not yet
>   affected,
> - linux-6.8/noble version 6.8.0-64.67 has v6.6.77, v6.12.14, not yet
>   affected,
> - linux-5.15/jammy version 5.15.0-144.157 has v5.15.184, affected and
>   the solution is not (yet?) backported to stable tree.
>
> - linux-oem-6.14/noble version 6.14.0-1005.5 has the former through
>   bug 2110095,
> - linux-oem-6.11/noble version 6.11.0-1024.24 has the former through
>   bug 2110095
>
> [ Test Plan ]
>
> The fix reduce log level from `drm_info()` to `drm_dbg_dp()`, so it
> shall stop to appear by default.
>
> Following messages flood kernel dmesg buffer after some GPU testing
> operations if reproduced:
> ```
> $ sudo dmesg|grep 'DP AUX transfer'
> ...
> amdgpu 0000:c4:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
> $ sudo dmesg|grep 'DP AUX transfer' | wc -l
> 896
> ```
>
> [ Where problems could occur ]
>
> Lower debug message level only.
>
> [ Other Info ]
>
> Nominate for oem-6.11, oem-6.14 and linux/jammy so far. For N/O/P, they
> should have both the cause and the fix at the same time if there is a
> next stable backport for them.
>
> Wayne Lin (1):
>   drm/amd/display: Avoid flooding unnecessary info messages
>
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> -- 
> 2.48.1
>
>
> -- 
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team
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