I'm checking test (2) from the test plan:

2. Verify the firmware blob is restored:

   $ md5sum /lib/firmware/amdgpu/sienna_cichlid_dmcub.bin

   Expected: 114036-byte blob, ucode 0x2020020, md5
fb312158b04675d9689803a34c06b0f6 (same as 0ubuntu2.26).

The shipped file is a zst, so uncompressing and then checking the md5:

$ zstdcat /lib/firmware/amdgpu/sienna_cichlid_dmcub.bin.zst | md5sum
fb312158b04675d9689803a34c06b0f6  -

It matches.

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https://bugs.launchpad.net/bugs/2163303

Title:
  [regression] linux-firmware 20240318.git3b128b60-0ubuntu2.29 causes
  half-screen corruption/black screens on AMD Navi 21; 0ubuntu2.26 works

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