2 Apr
2004
2 Apr
'04
12:22 a.m.
the problem appears to be that most USB hubs (like my port replicator) only
support asynchronous transfer while audio devices need isochronous
transfers. That would mean, most likely, that if I plugged a hub that
supports isochronous transfer, for example the griffin hub, into my
asynchronous docking station I would still have problems...
# lsusb -v | grep Synch
just gives numerous Synch Type none listings
so it looks like i have to ditch the docking station unless anyone else can
think of something :(
Thanks again,
- Jonathan Beilin
From: Steve Harris <S.W.Harris(a)ecs.soton.ac.uk>
Reply-To: A list for linux audio users
<linux-audio-user(a)music.columbia.edu>
To: linux-audio-user(a)music.columbia.edu
Subject: Re: [linux-audio-user] USB Audio + docking station/powered
hub(audiotrak optoplay)
Date: Thu, 1 Apr 2004 23:04:48 +0100
On Thu, Apr 01, 2004 at 12:36:28PM -0800, Jonathan Beilin wrote:
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Hi, I'm running gentoo on a dell inspiron
8600 with a docking station &
a
powered USB hub. When I'm undocked with the
audiotrak optoplay plugged
in
directly, it works fine. However, if I try to
plug the optoplay in to
the
docking station or the wall-wart powered USB hub
the optical-digital
light
is very faint and I get broken pipe reports when
I send a signal to the
device. What is wrong?
Thats interesting. This product:
http://www.griffintechnology.com/products/usbaudio_hub/ claims to be a
"USB Audio" hub, and I always thought it was BS, but maybe theres some
truth in it.
Sorry I dont have any helpful suggestions :( It could be that the audio
device is trying to draw more power from a single port than the hub or
docking station wants to provide, you can find out by running lsusb -vv as
root and looking for the MaxPower line of your audio device and the power
allowance (dunno what thats called) of the hub. The docking station will
probably be a hub too.
- Steve