[vfio-users] HDMI audio distortion and crackle randomly

[Aaron Campbell]

I doubt this is your issue, but if I reply it could help someone else who is searching about the same problem

I have a very modern Haswell machine that I set up to run KVM, with VGA passthrough for a very modern video card (GTX 970).  Since I didn’t care about the performance of the host video, I had installed an ancient PCI card for this purpose (I mean super ancient, like a Matrox Millenium or something like that).  With this setup, the audio in my Windows VM stuttered and lagged very badly.

As soon as I replaced the host video card, the problem went away.

So the takeaway is, just because your modern machine has a legacy (non-PCIe) slot, doesn’t mean you should use it. :-)

-Aaron

> On Dec 19, 2015, at 1:51 AM, nahoxou at netcourrier.com wrote:
> 
> Hi, 
> I have now upgraded virtual machine from win8 to win10 but I have still this HDMI audio issue.
> It seems my linux vm not affected by that.
> I use VGA passthrough so not soundhw hda...
> Sometimes if I'm lucky I can get back to normal the sound when reinit "NVIDIA High Definition Audio" device but reboot vm is the best.
> I tried different configs in win audio settings but nothing and I haven't another audio card to check.
> This issue appears randomly during session, idle or not...
> 
> Does anyone know please if it's vfio related? 
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