Re: [PROBLEM] ueagle-atm modem and usb mouse
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Wed, 9 May 2007, Stanislaw Gruszka wrote: > Hallo. > > At the beginning I would like to tell there are no problems when modem > works in bulk mode (use bulk IN endpoint for incoming data). Problems > are when use isoc data endpoint, which is already default in ueagle-atm driver. > On isoc mode ueagle-atm driver set fastest alternate setting for input interface, > which has wMaxPacketSize=1x1007 per frame (7.6 Mbits/s for fast usb) . > If usb_set_interface() fail driver try other isoc alternate setting, but bandwidth is > allocated asynchronously and usb_set_interface() return 0 most the time. > I think ueagle-atm driver should be more friendly to other (fast) devices > on bus and not resserve a lot of bandwidth when not needed. > But my only idea to achevie this is let the user choose proper alternate setting. > Does provide input_altsetting module param is good idea or there is some better way? > > There seems to be enough bandwidth to ueagle-atm in isoc mode and mouse, > but I have problems with these two connected to the same usb hub. > Tests was done on two machines, with kernel 2.6.21.1 + gregkh-all patch > applied. First one is old pentium 2 with uhci hcd, second one is > modern amd64 with ohci hcd. In older one when connecting modem to bus mouse > stops working (can not read any data from corresponding /dev/input/mouse > node). Even after disconnect modem there was no data from mouse, only replug > mouse help. In modern machine the same behavior was observable until kernel > version 2.6.19 and disappear in 2.6.20. So I suppose this can be fixed in > uhci too. If you need more debug info let me know, for now I only > attach "lsusb -v" output. Can you please provide the dmesg log from the Pentium-2 machine with UHCI and with CONFIG_USB_DEBUG set? Show what happens when you connect the mouse and then plug in the ueagle-atm device. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel