I've been having the suspend issue for the past week or so with the 5.13 
kernels on an Atari VCS, which has a AMD Ryzen Embedded R1606G with Radeon Vega 
Gfx. Current kernel installed is 5.13.0-27-generic. I've also noticed that 
anything that tries to use Vulkan as a display driver segfaults.
Upon bootup, dmesg has some bad looking errors in it:
[    2.772683] kfd kfd: amdgpu: error getting iommu info. is the iommu enabled?
[    2.772687] kfd kfd: amdgpu: Error initializing iommuv2
[    2.772899] kfd kfd: amdgpu: device 1002:15d8 NOT added due to errors

FWIW, I have this setup cloned to an Intel laptop, and everything
appears fine there. The 5.13 series even enabled my wireless card on
that laptop, since that wireless card wasn't supported until 5.12 or
later.

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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

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