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scanner Acer/Benq 3300U S2W. distro - Gentoo.
Mam tenhle skenner uz delsi dobu, spravne funguje na predchozim Gentoo (kernel 2.4.20), na novem Gentoo (kernel 2.6.7) se vse chova jinak.
na starem Gentoo mi sane-find-scanner vypsal

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a SCSI driver for your SCSI adapter.
  # Also you need support for SCSI Generic (sg) in your operating system.
  # If using Linux, try "modprobe sg".

found USB scanner (vendor=0x04a5, product=0x20b0) at /dev/usb/scanner0
found USB scanner (vendor=0x04a5, product=0x20b0) at libusb:004:003
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Scanners connected to the parallel port or other proprietary ports can't be
  # detected by this program.

  # You may want to run this program as root to find all devices. Once you
  # found the scanner devices, be sure to adjust access permissions as
  # necessary.

na novem gentoo uz jen

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a SCSI driver for your SCSI adapter.
  # Also you need support for SCSI Generic (sg) in your operating system.
  # If using Linux, try "modprobe sg".

found USB scanner (vendor=0x04a5, product=0x20b0) at libusb:003:004
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

  # You may want to run this program as root to find all devices. Once you
  # found the scanner devices, be sure to adjust access permissions as
  # necessary.

Zvlastni je, ze ROOT neni v tomto nikterak omezovan a MUZE KLIDNE SKENOVAT, dokonce vypis na sane-find-scanner obdrzi jiny a to

found USB scanner (vendor=0x04a5 [Color], product=0x20b0 [ FlatbedScanner 23]) at libusb:003:003

rozdil je i v scanimage -L

loki@Loki:~>scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

loki@Loki:~>sudo scanimage -L
device `snapscan:libusb:003:003' is a Acer FlatbedScanner23 flatbed scanner
loki@Loki:~>

zkousel jsem obvykle postupy s mknod c /dev/usb/scanner0 180 48 ale vypis sane-find-scanner se nezmenil, a skenovat jako uzivatel nemuzu.