ACK: [SRU][N][PATCH 0/3] Fix blank screen on external display after reconnecting the USB type-C

[Guoqing Jiang]

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

On 9/24/24 15:36, Chris Chiu wrote:
> BugLink: https://bugs.launchpad.net/bugs/2081786
>
> [Impact]
> The laptop of Intel RPL platform connects the external display via the HDMI/DisplayPort on a USB Type-C interfaced dock with dual type-C cable connected (WD19DC). The external display will stay blank after re-connect the docking station. It was observed on WD19DC with monitor 4K at 60fps mode.
>
> [Fix]
> The upstream fix in kernel 6.11 594cf78dc36f ("drm/i915/dp_mst: Fix MST state after a sink reset") and its dependency are required.
>
> [Test Case]
> 1. Connect the external monitor via the WD19DC docking station to the Intel powered laptop
> 2. Switch the monitor to 4K resolution and maximum refresh rate (>= 60fps)cul
> 3. Re-plug the WD19DC and check if the external display comes back in blank or normal.
>
> [Where problems could occur]
> Only observed on particular docking station and monitor. The risk should be low.
>
> Imre Deak (1):
>    drm/i915/dp_mst: Fix MST state after a sink reset
>
> Jani Nikula (2):
>    drm/i915/display: add generic to_intel_display() macro
>    drm/i915/display: add intel_display -> drm_device backpointer
>
>   .../gpu/drm/i915/display/intel_display_core.h |  3 ++
>   .../drm/i915/display/intel_display_device.c   |  3 ++
>   .../drm/i915/display/intel_display_types.h    | 37 +++++++++++++++++
>   drivers/gpu/drm/i915/display/intel_dp.c       | 12 ++++++
>   drivers/gpu/drm/i915/display/intel_dp_mst.c   | 40 +++++++++++++++++++
>   drivers/gpu/drm/i915/display/intel_dp_mst.h   |  1 +
>   6 files changed, 96 insertions(+)
>