Perhaps needs another entry started but it's related (since it didn't happen
before I tried RADV_PERFTEST=aco and AMD_DEBUG="nongg,nodma") so I'll post it
in case someone has had same issues as me.

After some time in Witcher 3 GOTY run with Lutris PC restarts on it's own. I
thought something is overheating (I've noticed graphic card memory in PSensor
sometimes reaching 90 so I thought maybe that's what's happening) but I
investigated kern.log and this always happened before that autonomous reset:

Nov  2 22:01:53 pop-os kernel: [  979.244964] pcieport 0000:00:01.1: AER:
Corrected error received: 0000:01:00.0
Nov  2 22:01:53 pop-os kernel: [  979.244967] nvme 0000:01:00.0: AER: PCIe Bus
Error: severity=Corrected, type=Data Link Layer, (Transmitter ID)
Nov  2 22:01:53 pop-os kernel: [  979.244968] nvme 0000:01:00.0: AER:   device
[1987:5012] error status/mask=00001000/00006000
Nov  2 22:01:53 pop-os kernel: [  979.244968] nvme 0000:01:00.0: AER:    [12]
Timeout               
Nov  2 22:01:53 pop-os kernel: [  979.262629] Emergency Sync complete

A solution I found is to add pci=nommconf in /etc/default/grub to the line 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" (so it looks like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pci=nommconf").