@olivierlambert

thank you! I did a little digging, but I could be looking at the wrong place, according to:

https://github.com/xcp-ng/qemu-dp/blob/master/qemu-options.hx

there is an option vga: none

DEF("vga", HAS_ARG, QEMU_OPTION_vga,
"-vga [std|cirrus|vmware|qxl|xenfb|tcx|cg3|virtio|none]\n"
" select video card type\n", QEMU_ARCH_ALL)
SRST
-vga type
...
none
Disable VGA card.

I tried setting this manually via "xe vm-param-set platform:vga=none " and I still get Cirrus PCI device created in the VM

Is there something else that needs to be done to have no virtual VGA in the VM at all?

@olivierlambert

and removing key vga from platform all together has the same result as switching to cirrus, there is still a virtual vga Cirrus Logic in the VM

@olivierlambert
it is still not clear to me how changing vga: std to vga: cirrus in platform parameter of a vm constitute turning off vga (this is what happens when you turn off vga in Xen Orchestra)

manually setting vga to off in platform produces the same result as vga: cirrus, VM still sees "VGA compatible controller [0300]: Cirrus Logic GD 5446 [1013:00b8]"

is there a way to completely turn off creating this virtual VGA in the VM?

@acebmxer in my case it appears to be a Wayland issue, using the wrong card. I was hoping that I could disable virtual gpu all together

curious though that disabling virtual GPU just changes the device id in the vm from 1234:1111 to "cirrus" - that seems to be a bug in XCP-ng

@miltador

I was able to get it working with kubuntu from 22.04 through 25.10, running X11 plasma session just by passing through PCI and running "nvidia-xconfig --enable-all-gpus --separate-x-screens to create xorg.conf" in the VM.

It used to work with Wayland as well on XCP-ng 8.2 and kubuntu 22.04 without any modifications to the VM (just had to create xorg.conf so SDDM would use correct display)

now Wayland tries to use 1234:1111 (that's how virtual GPU is showing up in the VM when vga=on ) or "Cirrus" 1013:00b8 (when vga is disabled), I'm still trying to figure out how to tell Wayland to use nvidia

I'm using Nvidia A4000, no iGPU

@miltador have you ever been able to figure this out? I'm having the same problem with plasmashell trying to use virtual gpu instead of nvidia