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Just to compare, follow the debug from the scanimage command:<BR>
<BR>
marcio@mama:~&gt; SANE_DEBUG_SNAPSCAN=255 scanimage -L<BR>
[sanei_debug] Setting debug level of snapscan to 255.<BR>
[snapscan] sane_snapscan_init<BR>
[snapscan] sane_snapscan_init: Snapscan backend version 1.4.50<BR>
[snapscan] add_usb_device(libusb:005:003)<BR>
[snapscan] add_usb_device: Detected (kind of) an USB device<BR>
[snapscan] snapscani_usb_open(libusb:005:003)<BR>
[snapscan] add_usb_device: Checking if 0x04b8 is a supported USB vendor ID<BR>
[snapscan] snapscani_check_device()<BR>
[snapscan] mini_inquiry<BR>
[snapscan] snapscan_cmd<BR>
[snapscan] snapscani_usb_cmd(0,0x7fff04fef750,6,0x7fff04fef720,0x7fff04fef748 (3 6))<BR>
[snapscan] atomic_usb_cmd(0,0x7fff04fef750,6,0x7fff04fef720,0x7fff04fef748 (36))<BR>
[snapscan] usb_cmd(0,0x7fff04fef750,6,0x7fff04fef720,0x7fff04fef748 (36))<BR>
[snapscan] usb_cmd: cmdlen=6, datalen=0<BR>
[snapscan] usb_write: writing:&nbsp; 0x12 0x00 0x00 0x00 0x24 0x00<BR>
[snapscan] Written 6 bytes<BR>
[snapscan] usb_read: reading:&nbsp; 0xf9 0x00 0x00 0x00 0x00 0x00 0x00 0x00<BR>
[snapscan] Read 8 bytes<BR>
[snapscan] usb_read: reading:&nbsp; 0x06 0x00 0x02 0x02 0x49 0x00 0x00 0x00 0x45 0x50&nbsp; ...<BR>
[snapscan] Read 36 bytes<BR>
[snapscan] usb_read: reading:&nbsp; 0xfb 0x00 0x00 0x00 0x00 0x00 0x00 0x00<BR>
[snapscan] Read 8 bytes<BR>
[snapscan] snapscani_check_device: Is vendor &quot;EPSON&quot; model &quot;EPSON Scanner&quot; a sup ported scanner?<BR>
[snapscan] snapscani_get_model_id(EPSON Scanner, 0, 2)<BR>
[snapscan] snapscani_get_model_id: looking up scanner for ID 0x04b8,0x0122.<BR>
[snapscan] snapscani_get_model_id: scanner identified<BR>
[snapscan] snapscani_check_device: Autodetected driver: Perfection 3490<BR>
[snapscan] snapscani_usb_close(0)<BR>
[snapscan] 1st read 3 write 1<BR>
[snapscan] snapscani_usb_cmd(0,0x7fff04fef7d0,6,0x0,0x0 (0))<BR>
[snapscan] atomic_usb_cmd(0,0x7fff04fef7d0,6,0x0,0x0 (0))<BR>
[snapscan] usb_cmd(0,0x7fff04fef7d0,6,0x0,0x0 (0))<BR>
[snapscan] usb_cmd: cmdlen=6, datalen=0<BR>
[snapscan] usb_write: writing:&nbsp; 0x00 0x00 0x00 0x00 0x00 0x00<BR>
[snapscan] Written 6 bytes<BR>
[snapscan] usb_read: reading:&nbsp; 0xfb 0x00 0x00 0x00 0x00 0x00 0x00 0x00<BR>
[snapscan] Read 8 bytes<BR>
[snapscan] 2nd read 4 write 2<BR>
[snapscan] snapscani_init_device_structure()<BR>
[snapscan] sane_snapscan_get_devices (0x7fff04ff0930, 0)<BR>
device `snapscan:libusb:005:003' is a EPSON EPSON Scanner flatbed scanner<BR>
[snapscan] sane_snapscan_exit<BR>
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