Hello,

I am trying to find some help for using a (rather old) Canon FS4000US film
scanner with VueScan. Here is my problem : I am running Debian Wheezy (32 bits),
and I have been using the scanner for quite a while under previous Debian
versions. Now VueScan doesn't detect the scanner any more, it says "No scanner
was found attached to your computer". I suppose the problem appeared when I
upgraded from Squeeze to Wheezy (I'm not 100% sure since I don't use the scanner
very often, but what else could it be ?)

VueScan works OK with my HP Photosmart b109a printer/scanner, and the Canon
works OK with the Windows version of VueScan ...

VueScan developer says it should be a problem with libusb, but I couldn't sort
it out, and I didn't find anything in the group archive (or on the Net). Any
help would be appreciated.

Thanks,
Jean-François Bosc, France

Check to see if there is a firmware request in dmesg.
Also try lsusb.
Also uplug it & plug it back while system is running & check dmesg& lsusb again.

Hello,

thanks and sorry for the late answer (I'm moving to another flat, the next answer might be late too ...)
Here are the logs for dmesg and lsusb after starting, stopping, and restarting the scanner :

tarbes:~> dmesg
[ 0.000000] Initializing cgroup subsys cpuset
...
[ 2137.597920] Did not find alt setting 1 for intf 0, config 1
[ 2349.544456] usb 1-4: USB disconnect, device number 3
[ 3812.472068] usb 2-6: new full-speed USB device number 3 using ohci_hcd
[ 3812.702044] usb 2-6: New USB device found, idVendor=04a9, idProduct=3042
[ 3812.702055] usb 2-6: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3812.702062] usb 2-6: Product: Scanner
[ 3812.702067] usb 2-6: Manufacturer: Canon
[ 4696.234625] usb 2-6: USB disconnect, device number 3
[ 4713.672030] usb 2-6: new full-speed USB device number 4 using ohci_hcd
[ 4713.902039] usb 2-6: New USB device found, idVendor=04a9, idProduct=3042
[ 4713.902047] usb 2-6: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4713.902054] usb 2-6: Product: Scanner
[ 4713.902058] usb 2-6: Manufacturer: Canon
tarbes:~> lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 046d:c069 Logitech, Inc. M500 Laser Mouse
Bus 002 Device 003: ID 04a9:3042 Canon, Inc. CanoScan FS4000US Film Scanner
tarbes:~>


I suppose there should be more in dmesg after the "Manufacturer" line, but ... nothing until I stop the scanner.

Jean-François

It's going to take a bit of googling as canon doesn't really support linux, so it will have to be some open source driver