[Bug 2081786] Re: Fix blank screen on external display after reconnecting the USB type-C

** Changed in: linux (Ubuntu Noble)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu Noble)
Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/2081786

Title:
Fix blank screen on external display after reconnecting the USB type-C

Status in HWE Next:
New
Status in linux package in Ubuntu:
New
Status in linux source package in Noble:
Fix Committed

Bug description:
[SRU Justification]

[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@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.

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