Does anyone have audio working on their MobilePro 800/880?  I don't get
any sound from my system, but it appears the kernel has the drivers in
it.

I am using the 7/12/04 GENERIC 1.6.2 kernel, and dmesg shows:

Audio0 at vraiu0: half duplex

audioctl -a shows (in part):
  name=VR4121 AIU
  config=AIU

So it appears that the kernel sees the device - but no sound.  Cat'ing
files or echoing characters to /dev/audio0, etc. don't error out - but
no sound.