Here a temporary workaround before a patch is released.
Disable Wayland uncommenting on /etc/gdm3/custom.conf the line
#WaylandEnable=false
to
WaylandEnable=false
and add the file /etc/X11/xorg.conf.d/10-monitor.conf
with the following lines:
Section "Monitor"
Identifier "DisplayPort-0"
Modeline "3440x1440_144.00" 1086.75 3440 3744 4128 4816 1440 1443 1453
1568 -hsync +vsync
Option "PreferredMode" "3440x1440_144.00"
EndSection
Modeline has been calculated by cvt tool with command:
cvt -v 3440 1440 144
Change the identifier with the port normally used to connect monitor.
This is necessary because X11 by default shows a maximum of 120hz.
Adding the 10-monitor.conf now on settings I've 143.91hz.
Now Suspend and Resume works with no freeze.
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https://bugs.launchpad.net/bugs/1971460
Title:
[amdgpu] System freezes coming out from suspension or randomly from
screen power save
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