Comment 329 for bug 1776563

I can't make gpu and suspend work at the same time on Acer A315 41G R6IM with Ryzen 2500U and Radeon 535.

If I use pci=noacpi gpu works fine, but laptop hangs on suspend, if I use ivrs_ioapic... suspend works fine but with no 2d gpu acceleration - everything works sluggish, very high cpu on scroling or moving windows etc., since, obviously, cpu does the work.

Tested kernel:
ubuntu 18.04 with 4.15 kernel
ubuntu 18.04. with 4.18 hwe kernel and hwe stack
also tried 19.04 from daily builds with no success, obviously gpu patch still didn't make it to kernel in 19.04 daily builds.

Tested kernel params:
ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2 clocksource=hpet iommu=on amd_iommu=on amdgpu.dc=1
amdgpu.runpm=0 radeon.modeset=0 amdgpu.dc=0
... other kernel arams mentioned in this thread

Any ideas on how to make Vega gpu run properly with ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2 (basically I don't need radeon 535 at all since I don't play games, I only need 2d acceleration for X) ?