I'm using a Lenovo Ideapad with a Ryzen 7 4700U on Ubuntu 20.04 focal,
and with the focal kernel 5.13.0-27 I still can't suspend the device.
Last working is 5.13.0-22

The mentioned released fix for impish, is it also included in the focal
version of 5.13.0-27 or do we have to wait longer for an focal fix?

If it's already included, and as my device is working perfectly fine, other 
than it won't get into suspend but hang itself on trying to, should that be 
further discussed here or in the as duplicate marked bug 1956422?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1956422

The lts-mainline kernel 5.15 is working fine, 5.16 not yet tested (jfyi)

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https://bugs.launchpad.net/bugs/1956401

Title:
  amdgpu hangs for 90 seconds at a time in 5.13.0-23, but 5.13.0-22
  works

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Impish:
  Fix Released
Status in linux source package in Jammy:
  Fix Released

Bug description:
  SRU Justification

  Impact:

  This does not occur with linux-image-5.13.0-22-generic, but does with 
linux-image-5.13.0-23-generic.
  On startup, I get about a 60 second hang, with the following in the kernel 
dmesg:
  Jan  4 15:26:36 inspiron-3505 kernel: [   34.160572] amdgpu 0000:04:00.0: 
amdgp : failed to write reg 28b4 wait reg 28c6
  Jan  4 15:26:56 inspiron-3505 kernel: [   54.189055] amdgpu 0000:04:00.0: 
amdgp : failed to write reg 1a6f4 wait reg 1a706
  Jan  4 15:27:16 inspiron-3505 kernel: [   74.329264] amdgpu 0000:04:00.0: 
amdgp : failed to write reg 28b4 wait reg 28c6
  Jan  4 15:27:36 inspiron-3505 kernel: [   94.337904] amdgpu 0000:04:00.0: 
amdgp : failed to write reg 1a6f4 wait reg 1a706
  I have the following GPU:
  04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Picass
  o (rev c2) (prog-if 00 [VGA controller])
  04:00.0 0300: 1002:15d8 (rev c2)
  (This is a Ryzen 5 3450U CPU with Radeon Vega Mobile.)

  I get a similar hang if I start firefox (when it's probing OpenGL
  contexts), and even with glxgears and glxinfo. Seems like anything
  that'd kick on a OpenGL context does it.  I had a freeze as well when
  I tried running firefox and glxgears both.  Along with odd BUG:
  messages logged (I have some in the attached log.)

  I was running with "iommu=pt", but did try with this removed, still
  got the errors (I think amdgpu driver uses the IOMMU even when it's
  set to IOMMU=pt though.).  See the attached log for some very odd
  "[Hardware Error]" messages that were logged on one test run.  I think
  this was when I tried to run firestorm (second life viewer) -- that
  had a large pause then opened to a black window.

  Per Google, I see there was a bug like this that turned up in kernel
  5.14.15 but fixed in 5.14.17.  See
  https://gitlab.freedesktop.org/drm/amd/-/issues/1770

  Thanks!
  --Henry

  Fix:
  upstream commit afd18180c070 ("drm/amdkfd: fix boot failure when iommu is 
disabled in Picasso.")

  Patch was included in the Impish kernel in -proposed (5.13.0.24.24)
  from an upstream patch set. multiple confirmations the problem is
  resolved with the kernel in -proposed.

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