Re: [Xen-users] Audio PCI passthrough issues in a Linux domU

[Arjen <arjenvanweelden@xxxxxxxxx>]

Hi,

I accidentally reproduce my audio passthrough problem in KVM and 
discovered a work-around for Xen. When I boot dom0 with 
pciback.hide=(00:1b.0), the passthrough appears to work but the sound 
playback is choppy and noisy.
Instead, I let the snd_hda_intel driver load and own the 00:1b.0 device 
during the boot of dom0. After starting dom0 I do a
xl pci-assignable-add 00:1b.0, which unloads the snd_hda_intel dirver, 
before starting the domU with PCI passthrough. Apparently, some kind of 
initialization by the dom0 (or KVM host) is necessary for smooth audio 
playback in the domU.
I don't know how this fixes my problem, but I hope this work-around 
might be useful for others with similar sound issues.
kind regards, Arjen

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