[alsa-devel] [PATCH v3] ALSA: usb: Work around CM6631 sample rate change bug

[Torstein Hegge]

On Tue, Mar 12, 2013 at 08:55:55AM +0100, Clemens Ladisch wrote:
> Torstein Hegge wrote:
> > There are still some issues with the Schiit Bifrost as described by
> > Chris Hermansen in "Status of CM6631 USB" on alsa-user [1]. While the
> > workaround fixes the sample rate change issue in some cases, he still
> > sometimes get mangled audio on sample rate change.
> >
> > Any ideas on what could be causing this difference between seemingly
> > similar hardware would be appreciated.
> 
> Different firmware.
> 
> > One difference is that 'lsusb -v' from the Schiit Bifrost [2] lists
> > interface 2-5, 7 and 8. My Corda [3] and the Asus card only lists
> > 0, Audio, Control Device
> > 1, Audio, Streaming
> > 2, Human Interface Device (this is number 6 in the Schiit)
> >
> > The extra interfaces listed by the Schiit is probably not backed by any
> > hardware in the CM6631.
> 
> Does the Schiit have all those Line/Mic/SPDIF/MIDI ports?

It only has a USB input. The SPDIF output of the CM6631 is connected to
a CS8416 SPDIF receiver.


Torstein