https://bugs.freedesktop.org/show_bug.cgi?id=100443
--- Comment #12 from taijian@posteo.de --- (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?