Joel Penner writes: > With both 9000f scanners connected, it's: > > pi at raspberrypi ~/sambashare2 $ sudo LD_LIBRARY_PATH=/usr/lib/:/lib > scanimage -L > device `pixma:04A91908' is a CANON Canoscan 9000F multi-function peripheral > device `pixma:04A91908' is a CANON Canoscan 9000F multi-function peripheral > pi at raspberrypi ~/sambashare2 $
The "pixma:04A91908" bit is what you pass to scanimage's --device-name option. This is then used by the pixma backend to decide which device it should use. Unfortunately, this backend is not (yet) able to tell the two devices apart. >> On Sun, Feb 23, 2014 at 12:15 AM, Joel Penner <joelcpenner at gmail.com> >> wrote: >> > Using lsusb -t I get this feedback: >> > >> > pi at raspberrypi ~ $ lsusb -t >> > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M >> > |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/3p, 480M >> > |__ Port 1: Dev 3, If 0, Class=vend., Driver=smsc95xx, 480M >> > |__ Port 3: Dev 11, If 0, Class=vend., Driver=usbfs, 480M So the USB layer has no problems telling your two devices apart. One reason that many backends do not want to expose the Dev part of this output is that it changes every time you reconnect or power-cycle your scanner. That leads to changing device names, something that confuses many users. The pixma backend is one of those backends and it has opted to exposo a device name that does *not* changes across reconnections, power-cycling and system reboots. It does so at the expense of not supporting two or more devices of the same make. >> > I do notice how sane-find-scanner returns the bus/port data: >> > >> > sudo sane-find-scanner >> > found USB scanner (vendor=0x04a9 [Canon], product=0x1908 [CanoScan]) at >> > libusb:001:011 >> > found USB scanner (vendor=0x0424, product=0xec00) at libusb:001:003 >> > >> > How would I use the libusb:001:011 identifier for the 9000f with >> > scanimage? This would require changes to the pixma backend code. It could for example add support for "pixma:libusb:001:011" style device name, possibly as aliases for "pixma:04A91908". That way, user with only one device don't have to bother with the changing device names, but users like yourself with more than one would be able to pick one or the other with the libusb "alias". The drawback of this is that it would show twice as many device names as are connected. >> > If I try to tell scanimage to use one of those with the -device option, I >> > get this feedback: >> > >> > pi at raspberrypi ~/sambashare $ sudo LD_LIBRARY_PATH=/usr/lib/:/lib >> scanimage >> > --progress --verbose --batch --format=tiff --resolution=2400 -x 240 -y >> 135 >> > -d libusb:001:011 --batch-start=110000 > /home/pi/sambashare/myco%5d.tif >> > scanimage: open of device libusb:001:011 failed: Invalid argument This tells scanimage to look for a libusb SANE backend. Such a backend does not exist so you get the invalid argument error. Hope this clarifies, -- Olaf Meeuwissen, LPIC-2 FLOSS Engineer -- AVASYS CORPORATION FSF Associate Member #1962 Help support software freedom http://www.fsf.org/jf?referrer=1962