Submitted by jon
Assigned to Default DRI bug account
Created attachment 143282
kernel 4.20.5 (compiled to try something newer than in the fedora repos)
MSI B350 Tomawhawk (Arctic)
Three Dell U2415 monitors (one dvi, one hdmi, one displayport).
Freezing when waking from sleep, usually withing just a few seconds. Example journactl attached. When it freezes, the mouse can still move, but no other input. Cannot click, cannot switch to virtual terminals, cannot send REISUB, cannot toggle off numlock (light frozen). Only thing that fixes it is a reboot of the computer.
Setting amdgpu.dc=0 appears to resolve the issue! Went from freezing when waking from sleep several times a day to >24 hours of uptime so far.
Also, when DC is enabled, displayport monitor will not wake from sleep. The only want I can get it to wake is xrandr --off and then --auto on the DisplayPort. I also want to mention that the displayport name changes every time it sleeps and wakes (DisplayPort-1, DisplayPort-2, DisplayPort-3) even though nothing is really being moved to a different port.
Attachment 143282, "journalctl":