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

Message ID 20240924073646.1036150-1-chris.chiu@canonical.com
Headers show
Series Fix blank screen on external display after reconnecting the USB type-C | expand

Message

Chris Chiu Sept. 24, 2024, 7:36 a.m. UTC 
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@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(+)