Alexander Kempshall <[email protected]> wrote: > I've recently bought the Trust 420A 4 Port Compact USB2 Hub. On the > http://www.qbik.ch/usb/devices/ there is a suggestion that it is Linux > compatible.
A USB hub needs no OS driver, it just works (tm). > In Slackware 10.1 when the hub is connected to my Canon N670U scanner, > start Kooka, the scanner is recognised but when I try to scan nothing > happens. Close Kooka down and start again the scanner is no longer > recognised. Unplug the USB cable the machine crashes. In dmesg I get > the following > > scanner.c: write_scanner(0): funky result: -32. Consult > Documentataion/usb/scanner.txt. Don't use the scanner module, it's obsolete, unmaintained, etc. rmmod it, and either remove the scanner.o file or add it to the hotplug blacklist (if you have hotplug installed). > The Scanner works perfectly if plugged directly into a usb port on the > mother board. Also the scanned works perfectly plugged into the > external hub using knoppix. Does your USB hub come with an AC adapter ? If yes, is it plugged in ? Same question for your scanner. If neither your USB hub nor your scanner come with an AC adapter, then you'll need to get another, AC powered, hub so that the scanner will get enough power from the USB bus. Currently, your scanner is under-powered, as you have too many bus-powered devices plugged on your USB bus. Hence the transfer errors. JB. -- Julien BLACHE <http://www.jblache.org> <[email protected]> GPG KeyID 0xF5D65169
