I have this problem as well. I'm running Ubuntu Feisty AMD64 and have a
2 sound card setup. Card 0 is a HDA Digital X-Mystique 7.1 (based on the
C-Media CMI8768 MC8 chipset), and card 1 is an old SB Ensoniq Audio PCI,
which also uses a Sigmatel chipset like the OP's card above. The C-Media
card doesn't have anything to do with the error, only the SB card and
its 'invalid character' is mentioned. Attached is the full error
message, which is the same as the above, apart from the different
chipset (it's in German too, btw). The application still works despite
this error.

** Attachment added: "mixer_error"
   http://librarian.launchpad.net/7384428/mixer_error

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error message when gnome-alsamixer is launching
https://bugs.launchpad.net/bugs/106903
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