On Thursday 10 May 2007 17:31, Alan Stern wrote: > On Wed, 9 May 2007, Stanislaw Gruszka wrote: > > > > 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. > > > > Ok, in dmesk.2 the modem is connected when there is open /dev/input/mouse > > file (for about 1 second). I can read data until close file and open it > > again. > > This looks like it's all working properly. When the mouse device is > opened it reserves 93 us of bandwidth. When the ueagle-atm driver puts > the modem into the highest-speed setting, it tries to allocate 36 + 794 > us, for a total of 923 us. This is more than the 900 us maximum bandwidth > allowed by the USB spec for periodic transfers, so the attempt fails. > > In this situation the ueagle-atm driver ought to fall back to a slower > setting. > > Conversely, if the modem is already running (and using 830 us of > bandwidth) when you open the mouse device file, the mouse driver won't be > able to allocate its 93 us. But if you would close the mouse device file > and turn off the modem, then the next time you open the mouse file it > ought to work. You shouldn't need to unplug the mouse. > > Can you try doing that experiment? If it doesn't work then send the dmesg > log. Mouse work when nobody open /dev/input/mouse file during modem is connected, but if someone open the file when there is no bandwidth, no data from the mouse file can be read even after modem is disconnected.
This is bug in input layer, return value of input_open_device() is not checked in file drivers/input/mousedev.c. But I see this is already fixed in input git tree. -- Regards Stanislaw Gruszka ------------------------------------------------------------------------- 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/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
