"xrandr" cannot find "1920x1080" as an available mode when using OpenBSD as a host from Linux with the "virtio" driver

Hello! I'm a new user trying OpenBSD. I'm trying OpenBSD with QEMU using
a Linux machine (more specifically Arch Linux, if that matters) as a host. Now,
the problem happens when I use the "virtio" driver to launch OpenBSD. In this
case, "xrand" will report that there was no "1920x1080" resolution available to
use. The max resolution I can use is "1280x768". The max refresh rate is "61.00"
while my screen support "75.00" so that's another problem. Now, when I use
the "std" driver to launch the virtual machine, xrandr can then set see that my
resolution is "1920x1080" and allows me to choose it. However, in that case,
for some reason, xrandr reports that my max refresh rate is "0.00" which is
weird to say the least...

So at this point, I'm pretty sure that it has to do with the driver. DragonflyBSD
had the same problem. The exact command I'm using to launch the virtual
machine is:

```
qemu-system-x86_64 -enable-kvm -drive file=VMs/Generic.img -m 2.5G \
-cpu host -smp 6 -vga <DRIVER> -display sdl,gl=on
```

Where <DRIVER> is the driver that is used, so "virtio" or "std". But again, I want
to use "virtio" because it has better performance.

Another information that is probably important is that my GPU is and AMD card,
more specifically, AMD RX 560. I also don't know if OpenBSD uses "amdgpu" or
"radeon" as the GPU driver at this point. I wasn't able to find how I can see that.

That was my first email to this list so I hope, I followed all the rules. Of course I
should also say that I have searched as much as I could before posting this email
and I couldn't find something. So thanks a lot to anyone that will read this email!
I know how precious your time is and I really appreciate it!