Comment 6 for bug 1839758

Tried your suggestion, but it didn't help so far. Latest kernel still can't have gnome started, while 5.0 HWE kernel produced result similar to previous ones.

I have verified that environment variable was set successfully:
$ printenv | grep -i amd_debug
AMD_DEBUG=nodcc

syslog:
steam.desktop[3741]: STEAM_RUNTIME_HEAVY: ./steam-runtime-heavy
kernel: gmc_v9_0_process_interrupt: 49 callbacks suppressed
kernel: amdgpu 0000:08:00.0: [gfxhub] VMC page fault (src_id:0 ring:158 vmid:2 pasid:32784, for process vulkandriverque pid 4088 thread vulkandriverque pid 4088)
kernel: amdgpu 0000:08:00.0: in page starting at address 0x0000000000000000 from 27
kernel: amdgpu 0000:08:00.0: VM_L2_PROTECTION_FAULT_STATUS:0x0020153D

drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=5205, emitted seq=5207
kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process vulkandriverque pid 4088 thread vulkandriverque pid 4088
kernel: [drm] GPU recovery disabled.