When I run an ubuntu or mint Linux VM in full-screen mode the screen blanks out when I switch away from the screen to the desktop or any other full-screen app. This seems to happen immediately and I have not been able to turn this off. Anyone know how to stop this from happening. I am running Parallels desktop pro 15 on a 2019 MacBook pro.
This is bug in our 3D engine. As temporary workaround you can disable 3D acceleration in VMs config (Configure->Hardware->Graphics->Advanced Settings->3D Acceleration)
FWIW, this seemed to be causing an issue where the only resolutions supported were 1024x768 or 800x600 (4:3). Once I disabled 3D acceleration, I was able to resize the window. Looking forward to a fix.