Thanks Scott, I hadn't gotten back to it yet but this is useful information. I'll give it a whirl.
Dara On Wed, 2005-02-02 at 17:16, Scott W Gifford wrote: > dara <[EMAIL PROTECTED]> 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, > > It's been a while since you asked your question, but here's an answer > anyways. > > Apparently using certain types of transfers on a high-speed hub with a > low-speed device is still unsupported: > > http://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 can't (yet) use full speed isochronous transfers through > USB 2.0 hubs. (At least without an experimental patch.) That > means: don't hook up USB 1.1 webcams, speakers, etc. to high > speed buses, they'll enumerate but you won't 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. > ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
