Re: Bose Companion 5 USB Audio stuttering on Vista

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Have been trying hard to understand what the problem really is, but it
is still very unclear to me...

It seems the 'Bose USB audio' driver is released by Microsoft.
So should I talk to Microsoft or Bose to get this fixed??
What exactly is the problem, which driver is causing it; usbaudio.sys?

Any help, hints or ideas on how to narrow down this USB audio problem
under Vista very much appreciated..


On Oct 7, 12:13 am, tido <tijd...@xxxxxxxxx> wrote:
Using Bose Companion 5 USB speakers on Vista-SP1 32bit edition i have
a problem that is best described as intermittent stuttering, from
mostly minor but always present, to sometimes strong 'dropouts', a few
times loosing the USB connection alltogether. Sounds a bit like my
tapedeck sounded many years ago with a dirty tape.

I tried to find any offending driver or anything that could interfere
with the audio driver to no avail. The Vista installation is clean and
up-to-date w. regard Microsoft updates. Disabled the built-in AC97
soundchip in the Bios, removed all sound related drivers. Removed all
special codecs. The speakers are connected directly to a USB 2.0 port
without a hub.

I then tried the Companion 5 speakers under Windows-XP SP2 and Ubuntu
Linux on the same PC hardware (multiboot). Under both these Operating
Systems the Companion 5 speakers perform flawless USB audio, no
installation problems of any kind, no stuttering of any kind, just
very perfect sound.

Next I tried an external Soundblaster Audigy 2 NX USB card on Vista,
connecting it with stereo cable to the line input on the Bose
speakers. No stuttering whatsoever occured. Only this way you loose
the 5.1 audio, and it is not so nice looking, since the line input is
on the desktop volume control hockey puck. So the Audigy USB card was
able to do good non stuttering USB audio on Vista!

As far as I can tell the stuttering really is a Vista / Bose specific
USB Audio driver problem.

It seems that the API for the USB audio driver has changed slightly
under Vista as compared to XP, and the driver must actively request /
configure realtime performance from the MSWMM subsystem.

Hoping Bose or Microsoft will release a USB audio driver fix very soon
now.

.

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