For any poor saps that encounter this in the future in a similar
situation, replacing the graphics driver with 'virtio' in the KVM/qemu
config fixes this:
<video>
<model type='virtio' vram='16384' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
Instead of the default 'cirrus' or whatever. Found this in my age-old
notes from the last time I encountered this problem a year ago. I'm not
sure whether this triggered a cache clear or whether the bit depth is
different or what...
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https://bugs.launchpad.net/bugs/1766938
Title:
gnome-shell crashed in
mutter:ERROR:x11/iconcache.c:303:standard_pict_format_for_depth: code
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