Comment # 161
on bug 110674
from Gargoyle
Hi there. I've been trying to solve some lockups and pauses with my system and have just read this entire thread. The good news is that I am another Radeon VII owner having the same problems and I am willing to do whatever I can to help. My current situation is:- - I'm running dual 2560x1440@60Hz via display port. - I am running the beta of ubuntu 19:10 (Linux ryzen1910 5.3.0-18-generic #19-Ubuntu SMP Tue Oct 8 20:14:06 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux). - I don't push the R:VII at all under Linux. I boot into Windows 10 to play games. - I have disabled IOMMU in BIOS/EFI. With IOMMU enabled things are MUCH worse. - My system is mostly stable. If the displays blank, sometimes after waking them I get the 15-30 second freeze. Then the "amdgpu [powerplay] Failed..." messages and then everything continues ok. I can semi-reliably recreate this by using the "xset dpms force off" command someone posted earlier. I've not managed to find any kind of pattern yet, but 8 out of 10 times running that command and then waking the system with a keypress/mouse click will cause the freeze. - I use X11 and not wayland. Not sure that is significant, but with Ubuntu 19:10 it seems wayland is started temporarily and then stopped during boot / starting gdm. If I enable IOMMU my GDM login screen will be completely corrupt. However, if I press enter (to select my user) and enter my password, my X11 gnome session starts. Although there are LOTS of pauses and warnings and errors all over the place in "journalctl -f".
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