Arch Linux

Description:
I would scan some images with my usb scanner but i can't use it.
i can configure it and scanimage -L find the scanner as user and root but they can't access the scanner.
my system is up2date with kernel 2.6.29-4
Firmware for the gt68xx backend is installed.
I attached the gt68xx.conf to this report.

i doesn't have a another scanner, to test it. All other devices are working like my mp3-player or keyboard and mouse.

scanimage -L:
[christian@Lin2Core ~]$ scanimage -L
device `gt68xx:libusb:002:004' is a Lifetec LT 9452 flatbed scanner

scanimage -T:
scanimage: open of device gt68xx:libusb:002:005 failed: Invalid argument

dmesg:
usb 2-2: new full speed USB device using ohci_hcd and address 4
usb 2-2: configuration #1 chosen from 1 choice
usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd skanlite rqt 192 rq 1 len 64 ret -71
usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd skanlite rqt 64 rq 1 len 64 ret -71
usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd skanlite rqt 64 rq 1 len 64 ret -71
usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd xsane rqt 64 rq 1 len 64 ret -71
usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd scanimage rqt 64 rq 1 len 64 ret -71

Additional info:
* package version(s)
* config and/or log files etc.


Steps to reproduce:
Connect a scanner (gt68xx-backend) to the computer.