I see the affected 5.15.0-161 kernel already has its own bug report:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2130287

Looks like this issue will continue to impact all Ubuntu 22.04 LTS users who 
stick with the 'stability' package and do not enable the HWE kernel stack.  
Reference:
https://ubuntu.com/kernel/lifecycle

See the Kernel release schedule in at URL above for the 5.15 kernel -
it's part of standard Ubuntu 22.04 LTS support for all 22.04.[0 or 1]
LTS users until April 2027.  (I would imagine that's many users...)

BTW the issue is also affecting discrete AMD graphics cards using amdgpu
driver on the 5.15.x kernel branch.  I've got a 6700XT PCIe card, on my
own PC.  (I also see the original system reported against was a 6900XT
PCIe card.)

In any event, the lines of code updated in the amdgpu_dm.c driver source
(from -160 kernel change, here https://git.launchpad.net/~ubuntu-
kernel/ubuntu/+source/linux/+git/jammy/commit/?id=ec132a249e314bf729771c93900349d5440b98f8
)

appear to remain unchanged through 5.15.0-163.173 (meaning whatever regression 
introduced won't have any fix for at least through the next -162 and -163 
releases):
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy/tree/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c?h=Ubuntu-5.15.0-163.173#n11330


Looks like this will be a problem for the 5.15 kernel user group for awhile :/.

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https://bugs.launchpad.net/bugs/2128729

Title:
  Black screen when booting 5.15.0-160 (on AMD Lucienne / Cezanne / Navi
  / Renoir / Rembrandt)

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