Arc B580 Passthrough: GPU works great in CachyOS guest, but completely missing HDMI audio?
Hey everyone,
I'm setting up a cloud gaming VM using an Intel Arc B580 passed through to a CachyOS guest.
The GPU itself is working perfectly, but I cannot get any audio over HDMI. In the CachyOS system settings/audio mixer, there are absolutely no output devices listed.
The weird part: If I run lspci -nnk inside the CachyOS VM, both the Intel graphics controller and the companion audio controller show up as connected PCIe devices. The hardware is definitely reaching the guest, but the OS just isn't recognizing the audio side as a functional sound card.
Has anyone run into this with Battlemage on Linux guests? Is there a specific kernel parameter, driver quirk, or PipeWire configuration I'm missing to make the audio initialize? Thanks!