[sane-devel] Problems with Canon CanoScan FB630U

[Johannes Bauer]

Hello List,

I wanted to report the troubles I have with the Canon CanoScan FB630U 
(USB scanner). The software I installed is the following:

libusb 0.1.7
sane-backends 1.0.14
xsane 0.91

The scanner is detected alright by sane-find-scanner:

found USB scanner (vendor=0x04a9, product=0x2204 [CanoScan FB630U]) at 
libusb:003:006

When doing a "scanimage -L" everything seems fine, too:

device `canon630u:libusb:003:006' is a CANON Canoscan FB630U flatbed scanner

Then, however (as root even):

# scanimage
scanimage: sane_start: Device busy

A couple of messages appear in the kernel log:

ppdev0: registered pardevice
ppdev0: unregistered pardevice
usb 3-1: usbfs: USBDEVFS_CONTROL failed cmd scanimage rqt 64 rq 12 len 1 
ret -71
[ This message repeats about 50 times ]
hub 3-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
hub 3-0:1.0: over-current change on port 1
usb 3-1: usbfs: USBDEVFS_CONTROL failed cmd scanimage rqt 64 rq 12 len 1 
ret -71
usb 3-1: usbfs: USBDEVFS_CONTROL failed cmd scanimage rqt 64 rq 12 len 1 
ret -71
usb 3-1: usbfs: USBDEVFS_CONTROL failed cmd scanimage rqt 64 rq 12 len 1 
ret -71
usb 3-1: USB disconnect, address 6
usb 3-1: new full speed USB device using address 7

I did not, however disconnect/reconnect the device! Every time I do a 
"scanimage", the device gets "relisted" and therefore the device address 
is incremented by one.

Does anybody have a clue what this could all be about? I'd be very grateful.

Greetings,
Johannes