| title: | Re Re USB Bluetooth dongle wont work when |
|
Thanks Scott,
I hadnt gotten back to it yet but this is useful information.
Ill give it a whirl.
Dara
On Wed, 2005-02-02 at 17:16, Scott W Gifford wrote:
dara <deargin@xxxxxxxxxx writes:
Hi,
I just wanted to report that I get this behaviour also.
[...]
I had also noticed when I got the dongle initially about 3 months ago
that it worked when directly connencted to the laptop, but not when
connected to the hub.
Hi Dara,
Its been a while since you asked your question, but heres an answer
anyways.
Apparently using certain types of transfers on a high-speed hub with a
low-speed device is still unsupported:
www.linux-usb.org/usb2.html www.linux-usb.org/usb2.html
In terms of functionality, the latest driver:
[...]
* Has partial support for split transactions (full and low speed
transfers) through USB 2.0 hubs:
[...]
o You cant (yet) use full speed isochronous transfers through
USB 2.0 hubs. (At least without an experimental patch.) That
means: dont hook up USB 1.1 webcams, speakers, etc. to high
speed buses, theyll enumerate but you wont be able to use
them otherwise. Eventually of course a dozen USB 1.1 webcams
will easily coexist at full data rate on a single USB 2.0 bus,
using USB 2.0 hubs.
The "ehci-hcd" module provides support for high-speed USB 2.0.
Removing it with rmmod makes everything run as low-speed USB 1.x, and
that seems to solve the problem.
I tested with the dongles I have: D-link DBT-120, Belkin F8T001,
AmbiCom BT2000, and IOGear GBU211. I tested plugged directly in,
plugged into a hub connected directly, and plugged into a hub
connected to a hub connected to a hub connected directly.
-----ScottG.
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