Increasing video memory appears to have fixed my problem. My virtual screen size is 1920x1080 and in virt-manager's Video panel / XML tab, vgamem was set to the default value of 16384. After increasing it to 65536, I'm no longer seeing the freeze (though with only a few minutes of testing, so far).
I don't know enough about this software to know if this means there is no flaw in QXL. If it does, then this bug report can be closed, although the freeze is a confusing failure mode. It would be nice if the overall user experience could be improved somehow. Perhaps the gnome Settings program's Displays panel could detect when a resolution is requested which exceeds available video memory and prevent it, preferably with a useful message to the user. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1972914 Title: frequent 15-sec guest freeze with ubuntu 22.04 host and guest To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-qxl/+bug/1972914/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
