** Changed in: linux-oem-6.11 (Ubuntu Noble)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/2090898

Title:
  DSC through MST for Intel and AMD platforms

Status in HWE Next:
  New
Status in linux-oem-6.11 package in Ubuntu:
  New
Status in linux-oem-6.11 source package in Noble:
  Fix Committed

Bug description:
  [Impact]
  DSC over MST doesn't work well, especially for multiple monitors or dual 
5k@120Hz.

  [Fix]
  Most of the patches are backported from 6.11.5, and the following patches are 
from v6.12 and drm-tip

  From v6.12-rc1
  5c7b393452b5 drm/i915/dp_mst: Enable LT fallback between UHBR/non-UHBR link 
rates
  e44bc451aa4b drm/i915/dp_mst: Ensure link parameters are up-to-date for a 
disabled link
  e40fbf616610 drm/i915/dp_mst: Reprobe the MST topology after a link parameter 
change
  9d1f218ddce2 drm/i915/dp_mst: Queue modeset-retry after a failed payload BW 
allocation
  8f1fe39ded72 drm/i915/dp_mst: Configure MST after the link parameters are 
reset
  aa705f7ec6e2 drm/i915/dp_mst: Reduce the link parameters in BW order after LT 
failures
  96c468c366da drm/i915/dp: Add helpers to set link training mode, BW parameters
  634e1804242b drm/i915/dp: Add a separate function to reduce the link 
parameters
  a4530e20fadd drm/i915/dp: Send only a single modeset-retry uevent for a commit
  a3f91f405aa7 drm/i915/dp: Initialize the link parameters during HW readout
  a64d5fe490cd drm/i915/ddi: For an active output call the DP encoder 
sync_state() only for DP
  0cf09702a118 drm/dp_mst: Simplify the condition when to enumerate path 
resources
  dbaeef363ea5 drm/dp_mst: Add a helper to queue a topology probe
  e9b36c5be2e7 drm/dp_mst: Factor out function to queue a topology probe work
  b1d43e6fb38f drm/i915/dp: Flush modeset commits during connector detection

  From drm-tip
  734148a1d8d1 drm/i915/adlp+/dp_mst: Align slave transcoder enabling with spec 
wrt. DDI function
  e203443c3a3f drm/i915/ptl/dp_mst: Fix slave transcoder enabling wrt. DDI 
function

  [Test]
  Connect 2 4k@60hz or higher resolution or higher refresh rate monitors to the 
dock and connect the dock to the DUT, the external monitors should work well.

  [Where problems could occur]
  It may affect the disply output through dock on both Intel and AMD platforms.

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