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
Public bug reported:
I'm running a new installation of Ubuntu 22.04 Desktop on a Thinkpad
T450s (core i5-5200, 2 cores / 4 vCPUs, 12 GB memory). Using the virt-
manager GUI, I performed what I believe is a simple, plain-vanilla
installation of an Ubuntu 22.04 guest running under qemu/kvm with 2
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