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


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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