Created attachment 137103 [details]
dmesg output without amdgpu.dc=1

I'm seemingly hitting this too, on 4.15. Note that I get it with or without
amdgpu.dc=1.

Might also be relevant that on 4.14 and earlier, I would get kernel oopsies on
resume from suspend, with a very similar dmesg output (oopsie would happen in
the same dm_suspend function and same stack trace, as far as I can recall).
While I don't have any saved dmesg's from that, I could boot an old kernel to
obtain one if it seems useful.

I have slightly different hardware (eg, Radeon RX 570), but it's also a hybrid
laptop.