"shiju mathew" <[EMAIL PROTECTED]> writes: > Hi, > Thanks for the info. I could also solve the problem by removing the > usb 2.0 driver. But is this a problem with the usb 2.0 driver or some > with some other driver? Has this bug raised in the bug list ? If not I > would bring this bug to the developers notice so that it could be > fixed soon.
Here a repost of what I found when looking into the problem for myself. I'm no USB expert, so this is pretty much the extent of my knowledge. :) 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. ----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
