(In reply to Christian Lanig from comment #11)
> Created attachment 132574 [details]
> Another dmesg log with kernel 4.12
> 
> Neither "suspend of IP block <vce_v3_0> failed" nor "failed to send pre
> message 62 ret is 0" is displayed by dmesg with my setup.

The difference here is probably that your system is a desktop, whereas I have a
laptop with a hybrid Intel/AMD GPU setup (HD630 + RX470). So your GPU probably
does not try to power down, because it is always needed to drive your display?