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Re: [Xen-devel] pvops dom0: no sound after boot; possibly caused by swio

To: "Ronny.Hegewald@xxxxxxxxx" <Ronny.Hegewald@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] pvops dom0: no sound after boot; possibly caused by swiotlb
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 26 Jan 2010 07:37:12 +0000
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Thread-topic: [Xen-devel] pvops dom0: no sound after boot; possibly caused by swiotlb
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On 26/01/2010 00:40, "Ronny.Hegewald@xxxxxxxxx" <Ronny.Hegewald@xxxxxxxxx>

> When playing audio in dom0 there are just "knock" sounds.

Your bug report seems to talk about dom0 and then switches seamlessly to
talking about sound and swiotlbs in domUs. It's unclear.

 -- Keir

> After rmmod the kernel-module for the soundcard (snd-hda-intel) and oss
> modules (snd-seq-oss and snd-seq-pcm) and inserting them with modprobe again
> makes the sound work. Doing that only with snd-hda-intel doesnt help.
> I compiled the sound-modules directly into the kernel but that didnt changed
> anything.
> This problem doesnt appear with the gentoo-dom0 patches for kernel 2.6.31 so
> it looks like a pvops dom0 problem.
> Strangely that problem doesnt appear on another system with the same
> xen-version and the exactly same kernel. Main-difference is that the other
> system is a 2-core AMD-system with 2 GB Ram and a different soundcard.
> But starting the domU with only 2 GB didnt made any difference.

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