Public bug reported:
[SRU Justification]
[SRU Justification]
[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 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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Noble)
Importance: Undecided
Status: In Progress
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Noble)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2081786
Title:
Fix blank screen on external display after reconnecting the USB type-C
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