linux-kernel - Re: [Alsa-devel] snd-usb-audio problems with 2.6.18

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Date:	Sat, 23 Sep 2006 15:23:19 +0200
From:	"Markus Rechberger" <mrechberger@...il.com>
To:	linux-kernel@...r.kernel.org, alsa-devel@...ts.sourceforge.net
Subject: Re: [Alsa-devel] snd-usb-audio problems with 2.6.18

Hi David,

this issue might be hidden within the usb subsystem.
USB bandwidth allocation doesn't work 100% yet afaik, better turn off
support for it when configuring your kernel.

Markus

On 9/23/06, David Härdeman <david@...deman.nu> wrote:
> A recent 2.6.18 kernel upgrade on one of my machines broke usb audio.
>
> I'm using a TerraTec Aureon 5.1 USB MKII to feed ac3 audio to a
> receiver, but after the upgrade, trying to play any audio (tried aplay,
> mplayer, xine, etc...using both oss and alsa audio) results in the
> kernel log being filled with the message:
>
> "cannot submit datapipe for urb 5, error -28: not enough bandwidth"
>
> Unfortunately the upgrade was from 2.6.14 (yes, it's old but the machine
> has no network connection usually) so there is quite a lot of
> differences to the snd-usb-audio driver in the meantime.
>
> Unless someone has suggestions as to a simple fix, I guess I'll
> start testing kernels in the 2.6.14 <-> 2.6.18 range soon to try to pin
> down a certain changeset...
>
> --
> David Härdeman
>
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-- 
Markus Rechberger
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