after latest kernel patch upgrade, i.e. from
kernel-default-5.3.18-150300.59.76.1 to kernel-default-5.3.18-150300.59.81.1,
on host, host fails to start libvirt/qemu guests: "virsh start guest" reports
guest started, but guest remains inaccessible, and the console window within
virt-manager stays at a pure black screen.  reboot host to previous kernel
5.3.18-150300.59.76-default, and qemu guests start up as usual.

i observed this on hosts running leap 15.3 with all patches installed.  which
further information about the case is needed?