Daniel:
To be concise-
1) I have tested with Alsa 1.0.24 and 1.0.25.
2) These devices (CMedia, Tenor and Audio Widget) have always had the same
issues. They did not change from the first version of UAC2 support.
3) XMOS based USB interfaces work fine.
4) Alex Lee came up with a workaround to get the Audio Widget to work on
Linux, that is not compatible with Windows (Thesycon driver) or OSX. He can
explain far better than I can.
How can I help resolve these issues? Would hardware help?
Demian
-----Original Message-----
From: Daniel Mack [mailto:zonque@xxxxxxxxx]
Sent: Tuesday, June 12, 2012 12:50 AM
To: Demian Martin
Cc: 'Andrew Dunn'; alsa-user@xxxxxxxxxxxxxxxxxxxxx;
musicpd-dev-team@xxxxxxxxxxxxxxxxxxxxx; 'Clemens Ladisch'
Subject: Re: [Musicpd-dev-team] Schiit Bifrost, usb, C-Media 6631, ALSA/MPD
On 11.06.2012 20:50, Demian Martin wrote:
> Daniel:
> I have similar problems with the CM6631, the Tenor 8802 and the Audio
> Widget.
>
> In both examples of the CM6631 I have the same bad sounds happen with
> sample rate changes that go away with a pause-play cycle. The Tenor is
> more problematic and really only functions at 44.1. At other sample
> rates with several different Tenor firmware builds it just stutters
> badly. I'm told its rate feedback works in 10Hz steps. For the Audio
> Widget Alex Lee came up with a workaround patch for the 44-48 to 88-96
> sample rate switch where the rate feedback seems to go awry.
Which kernel version do you test this on? And are you saying this is a
regression from older versions?
Daniel
>
> What error messages or logs would you like to see?
>
> I have been trying to borrow a USB2 sniffer but with no luck. Even the
> rent is too steep for me. I would really like to get this resolved. I
> have access to pretty much all the current UAC2 chip options (don't
> have the Via but no one is really using it yet). I can even arrange
> remote access to a machine with them attached if that helps.
> Demian
>
> -----Original Message-----
> From: Daniel Mack [mailto:zonque@xxxxxxxxx]
> Sent: Monday, June 11, 2012 12:00 AM
> To: Andrew Dunn
> Cc: alsa-user@xxxxxxxxxxxxxxxxxxxxx;
> musicpd-dev-team@xxxxxxxxxxxxxxxxxxxxx;
> Clemens Ladisch
> Subject: Re: [Musicpd-dev-team] Schiit Bifrost, usb, C-Media 6631,
> ALSA/MPD
>
> On 08.06.2012 20:40, Andrew Dunn wrote:
>> Apologies, I had returned that Bifrost and been using another device
>> based on the XMOS chip (Worked perfectly). I now have a new Bifrost
>> and I'm running Fedora 17 with ALSA 1.0.25
>
> Thanks for the dump. Are there any suspicious entries written to
> /var/log/messages when you plug in the device and start streaming?
>
>
> Daniel
>
>
>
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