Necrobumping, but might be interesting for other people using the same hardware.
I recently bought the GSX 1200.
To setup a working audiovm with 7.1 support I needed to:
- Follow theses instruction Setting up an audio VM - #24 by hamenarin , but replace fedora-34-xfce by fedora-35-xfce as official support for 7.1 was added for pulseaudio 15.0 and pulseaudio 15.0 is available for fedora-35+ ( see the “packages” part of this post for the package that need to be installed Guide on using an USB audio device with Qubes 4.1 - #3 by enmus )
- Doing a USB passthrough of the GSX 1200 seems to not be supported (Linux kernel complaining about “usb usbX: Not yet implemented” ), so I ended up merging the audiovm with the usbvm for this usb controller