this is on woody:

$ ls -al /dev/usbscanner0
crw-rw-rw-    1 root     root     180,  48 Jun 13 13:29 /dev/usbscanner0

cat /etc/sane.d/epson.conf

# epson.conf
#
# here are some examples for how to configure the EPSON backend
#
# SCSI scanner:
#scsi EPSON
#
# Parallel port scanner:
#pio 0x278
#pio 0x378
#pio 0x3BC
#
# USB scanner - only enable this if you have an EPSON scanner. It could
#               otherwise block your non-EPSON scanner from being
#               recognized.
usb /dev/usbscanner0

If I set the environment variable SANE_DEBUG_EPSON=128
I get when running xsane or xscanimage or scanimage:

[EMAIL PROTECTED]:~/.ssh$ xsane
[sanei_debug] Setting debug level of epson to 128.
[epson] sane_init: sane-backends 1.0.7
[epson] sane_init, ># epson.conf<
[epson] sane_init, >#<
[epson] sane_init, ># here are some examples for how to configure the EPSON
backend<
[epson] sane_init, >#<
[epson] sane_init, ># SCSI scanner:<
[epson] sane_init, >#scsi EPSON<
[epson] sane_init, >#<
[epson] sane_init, ># Parallel port scanner:<
[epson] sane_init, >#pio 0x278<
[epson] sane_init, >#pio 0x378<
[epson] sane_init, >#pio 0x3BC<
[epson] sane_init, >#<
[epson] sane_init, ># USB scanner - only enable this if you have an EPSON
scanner. It could<
[epson] sane_init, >#               otherwise block your non-EPSON scanner from
being<
[epson] sane_init, >#               recognized.<
[epson] sane_init, >usb /dev/usbscanner0<
[epson] sane_init, >usb /dev/usbscanner0<
[epson] attach(usb /dev/usbscanner0)
[epson] SANE Epson Backend v0.2.19 - 2002-01-18
[epson] attach(usb /dev/usbscanner0)
[epson] attach: opening usb /dev/usbscanner0
[epson] send buf, size = 2
[epson] buf[0] 1b .
[epson] buf[1] 40 @


perhaps it really can't find the device?

sane-find-scanner: found USB scanner (vendor = 0x04b8, product = 0x0110) at 
device /dev/usbscanner0


Note that I did:

 modprobe scanner vendor=0x04b8 product=0x0110

[EMAIL PROTECTED]:~/.ssh$ lsmod
Module                  Size  Used by    Not tainted
sg                     28196   0 (autoclean) (unused)
scsi_mod               85304   1 (autoclean) [sg]
scanner                 8448   0
hid                    18720   0 (unused)
loop                    8144   0 (autoclean)
mousedev                3808   1
input                   3360   0 [hid mousedev]
usb-uhci               20932   0 (unused)
usbcore                48416   1 [scanner hid usb-uhci]
3c59x                  25064   1
unix                   13700 151 (autoclean)
ide-disk                6592   6 (autoclean)
ide-probe-mod           7984   0 (autoclean)
ide-mod               129452   6 (autoclean) [ide-disk ide-probe-mod]
ext2                   30368   0 (autoclean) (unused)
ext3                   56480   5 (autoclean)
jbd                    34856   5 (autoclean) [ext3]



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