It's already in mantic and 6.6:

https://git.launchpad.net/~ubuntu-
kernel/ubuntu/+source/linux/+git/mantic/commit/?h=master-
next&id=e21d1a38e83ce7f7f8d99c857b941b59c2ddc22f

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https://bugs.launchpad.net/bugs/2046504

Title:
  Fix AMDGPU display on lower resolution modes

Status in HWE Next:
  In Progress
Status in linux package in Ubuntu:
  New
Status in linux-oem-6.5 package in Ubuntu:
  In Progress
Status in linux source package in Jammy:
  Invalid
Status in linux-oem-6.5 source package in Jammy:
  In Progress

Bug description:
  [Impact]
  AMD GPU display is blank when set lower resolution than native mode on eDP.

  [Fix]
  On eDP the invalid modes are set, call mode set for valid modes instead.

  [Test]
  Tested on hardware, all the modes shown in gnome menu can be set OK.

  [Where problems could occur]
  It may break AMD display.

  This issue is not reproduced on v6.2- kernel versions, so SRU for
  oem-6.5 only.

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