since the sysfs does not show fw difference, here's the change in files:
$ diff old_fw new_fw 
8,9c8
- e2ddb912bf242e3b1b4219b36a19bff7  /lib/firmware/amdgpu/raven2_rlc.bin
- 27168d5b60ef396926a2aa0e2da00a97  /lib/firmware/amdgpu/raven2_sdma1.bin
---
+ 4ac07f88b9c4aa4fe026be87cb16ceda  /lib/firmware/amdgpu/raven2_rlc.bin

(In reply to Jan Vesely from comment #4)
> The issue appears fixed with new firmware, but now the laptop won't suspend.

The same workaround as before fixes the suspend/resume issue.

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:709
+                      vm_size = min(vm_size, 1ULL << 40);