[Bug 109135] R9 390 hangs at boot with DPM/DC enabled for kernels 4.19.x and above, says KMS not supported

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109135

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
Looks VCE related:

Dec 24 21:12:11.223675 tom-comp kernel: [drm:amdgpu_vce_ring_test_ring
[amdgpu]] *ERROR* amdgpu: ring 12 test failed
Dec 24 21:12:11.223708 tom-comp kernel: [drm:amdgpu_device_init.cold.17
[amdgpu]] *ERROR* hw_init of IP block <vce_v2_0> failed -110

If you can live without hardware accelerated video encoding,
amdgpu.ip_block_mask=0xff on the kernel command line might serve as a
workaround.

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