Dear Maintainer,

I run Debian bullseye in both the host and guest. I have a 5120x1440 screen
which works perfectly fine in the host.
When using the guest in fullscreen mode, I want it to use 5120x1440 as well.
It is however not available in the gnome screen resolution menu, instead 5120x2160
shows up which is a bit awkward to use because it crops the bottom.

Using Debian Buster instead of Bullseye in the guest works as expected.
Ubuntu 20.04 as a guest has the same problem as Debian Bullseye.
I have tried changing the video model in virt-manager to see if it helps, it doesn't.

An observation is that both Ubuntu 20.04 and Debian Bullseye, when run as guests,
report the screen as "Red Hat, 53 inch''". Debian Bullseye reports it as "Unknown display".

Thanks, Paul