I just ran into this bug as well. Using Kubuntu 9.04 (KDE 4.2.4) and an
Maudio Delta Audiophile 2496. The funny thing is that this is a quite
fresh install and everything worked fine until a day ago when I
installed, then uninstalled some gstreamer-related packages
(libgstreamer0.10-dev, gstreamer0.10-alsa, ...). Then suddenly the
soundcard was not recognized at all anymore. I had to power down the
machine, remove the card, power it up again, then repeat with the card
reinserted. But now the internal clock rate is stuck at ICE958 (the
S/PDIF) which I don't use so the card has no valid clock rate set. This
results in no output at all from the soundcard and applications that
play sound freeze one way or the other.

Even funnier is that I just rebooted and had a look at alsamixer on a
virtual console, i.e. *before* logging into KDE. There it was no problem
to set the internal clock rate to something other than ICE958. I set it
to 96000 and tested with aplay /usr/share/sounds/k3b_success.wav which
worked fine.

*Then* logging into KDE I found that the problematic control was stuck
again and there was no way to set it to anything else. I have no idea if
this is KDE-specific (Phonon?) or a general problem with desktop
environments that provide some level of control over the sound
hardware/API. But it definitely depends on whether KDE is running or
not: logging out and checking alsamixer on a virtual console I was able
to set the internal clock rate again.

I am not sure how to debug this properly or what part of KDE is
responsible here.

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alsa mixer Multi Track Internal Clock stuck on IEC958 and operation error
https://bugs.launchpad.net/bugs/86325
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