ACK: [PATCH 0/1][SRU][N][O] The system hangs after resume with thunderbolt monitor(AMD GPU [1002:1900])

[Guoqing Jiang]

Acked-by: Guoqing Jiang <guoqing.jiang at canonical.com>

On 9/30/24 10:55, Chia-Lin Kao (AceLan) wrote:
> BugLink: https://bugs.launchpad.net/bugs/2083182
>
> [Impact]
> The system hangs on blackscreen with thunderbolt monitor while resume from suspend state.
>
> [Fix]
> The TBT monitor HPD will be triggered during the resume procedure
> and call the drm_client_modeset_probe() while
> struct drm_connector connector->dev->master is NULL.
>
> It will mess up the pipe topology after resume.
>
> AMD submitted a patch to fix this issue.
> https://lore.kernel.org/all/20240927170103.102180-3-Jerry.Zuo@amd.com/T/#e868f6b967ec79ae85c5a8a446be9b5d5c97e5427
>
> [Test case]
> 1. Boot to OS
> 2. Plug thunderbolt monitor to the system.
> 3. Enter suspend
> 4. Press the power button to resume from suspend
> 5. Should not hang
>
> [Where problems could occur]
> Pretty low chance to introduce any regressions.
> The patch won't do anything bad to the system while resuming,
> the probing will be done after resumed.
>
> Tom Chung (1):
>    UBUNTU: SAUCE: drm/amd/display: Fix system hang while resume with TBT
>      monitor
>
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>