https://bugs.freedesktop.org/show_bug.cgi?id=28030
--- Comment #2 from Christian König deathsimple@vodafone.de 2010-05-09 11:56:10 PDT --- The initialisation path for the IGP version of the chipset is missing a call to r600_audio_init, so audio isn't enabled on those chipsets.
I've attached a patch to fix the problem, but beside from a compile check its completely untestet since i don't have access to an IGP version of the chipset.