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

[Stefan Bader]

On 24.09.24 09:36, 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(+)
> 

This was already applied as part of the "Noble update: upstream stable 
patchset 2024-10-11". I have adjusted the previously applied commits to 
include the bug number of this submission.

-- 
- Stefan

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_0xE8675DEECBEECEA3.asc
Type: application/pgp-keys
Size: 48643 bytes
Desc: OpenPGP public key
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20241011/d8dd315a/attachment-0001.key>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20241011/d8dd315a/attachment-0001.sig>