Canon Lide50 not working

Question

Hi,
first of all i love my archlinux, but now my Scanner Canon Canoscan Lide50, which used to work on Kubuntu, refuses to work on Archlinux.
I added my user to the group scanner.
$ sane-find-scanner
found USB scanner (vendor=0x04a9 [Canon], product=0x2213 [CanoScan], chip=GL841) at libusb:001:006
$ scanimage -L
device `genesys:libusb:001:006' is a Canon LiDE 35/40/50 flatbed scanner
$ scanimage -v
scanimage: sane_start: Error during device I/O
Any scanning, also with Xsane, is aborted in that way. Has anyone a Canon Lide (<=50) running and can give me a hint?
Thanks
redada

Answer 1

Thank you for your efforts, guys.
@scottish: I understand that my scanner works under many distros, I have even tried (under Mandriva), and it worked out-of-the-box. Since then only my OS has changed, so I suppose the problem is more Arch-specific.
fnaaijkens' "chmod 644" hint on the H4L page didn't help, it just hid my scanner from "scanimage -L" if listing scanners as user. However file permissions are easily configurable through udev's MODE, so chmod is not needed at this point (the udev default for scanners is MODE="0664").
Anyway, thanks for the udev hint, I've learnt much from its man pages, and it seems to be promising. However it is mainly for a) managing device nodes, which I suppose not to be so important in my case, since scanimage/xsane finds the scanner, no more device nodes needed; and b) handle user space actions, which could mean loading kernel modules or whatever, but I don't know which actions should I take as a udev rule.
@B: No, as root I get exactly the same results. According to the SANE homepage manual you suggested, I increased debug verbosity:
[barci@barcipc ~]$ export SANE_DEBUG_SANEI_USB=4
[barci@barcipc ~]$ export SANE_DEBUG_GENESYS=4
[barci@barcipc ~]$ export SANE_DEBUG_GENESYS_GL841=4
[barci@barcipc ~]$ scanimage -d genesys:libusb:001:042
[sanei_debug] Setting debug level of genesys to 4.
[genesys] SANE Genesys backend version 1.0 build 11 from sane-backends 1.0.20
[sanei_debug] Setting debug level of sanei_usb to 4.
[sanei_usb] sanei_usb_init: marking existing devices
[sanei_usb] sanei_usb_init: Looking for kernel scanner devices
[sanei_usb] sanei_usb_init: Looking for libusb devices
[sanei_usb] sanei_usb_init: found libusb device (0x04a9/0x2213) interface 0 at libusb:001:042
[sanei_usb] store_device: add dn 0 with libusb:001:042
[genesys] sane_init: little endian machine
[sanei_usb] sanei_usb_find_devices: vendor=0x04a9, product=0x2213
[genesys] attach: trying to open device `libusb:001:042'
[sanei_usb] sanei_usb_open: opened usb device `libusb:001:042' (*dn=0)
[genesys] attach: device `libusb:001:042' successfully opened
[sanei_usb] sanei_usb_get_vendor_product: device 0: vendorID: 0x04a9, productID: 0x2213
[genesys] attach: found Canon flatbed scanner LiDE 35/40/50 at libusb:001:042
[genesys] sane_open: found `canon-lide-50' in devlist
[sanei_usb] sanei_usb_open: we already have a bulk-in endpoint (address: 0x81), ignoring the new one
[sanei_usb] sanei_usb_open: we already have a bulk-out endpoint (address: 0x02), ignoring the new one
[sanei_usb] sanei_usb_open: we already have a int-in endpoint (address: 0x83), ignoring the new one
[sanei_usb] sanei_usb_open: opened usb device `libusb:001:042' (*dn=0)
[genesys] init_options: custom gamma disabled
[sanei_debug] Setting debug level of genesys_gl841 to 4.
[genesys_gl841] gl841_slow_back_home: already at home, completed
[genesys_gl841] gl841_init_scan_regs settings:
Resolution : 300DPI/300DPI
Lines : 1
PPL : 4
Startpos : 0/0
Depth/Channels: 16/3
Flags : 37
[genesys_gl841] gl841_init_scan_regs : stagger=0 lines
[genesys_gl841] gl841_init_scan_regs : exposure_time=1866 pixels
[genesys_gl841] gl841_init_scan_regs: move=0 steps
[genesys_gl841] gl841_init_scan_regs: move=0 steps
[genesys_gl841] gl841_init_scan_regs: physical bytes to read = 48
[genesys_gl841] gl841_init_scan_regs: total bytes to send = 54532764
[genesys_gl841] gl841_init: starting dummy data reading
[genesys] Calibration filename set to:
[genesys] >/home/barci/.sane/canon-lide-50.cal<
[genesys] read_calibration: reading one record
[genesys_gl841] gl841_slow_back_home: already at home, completed
[genesys] genesys_flatbed_calibration
[genesys_gl841] gl841_init_scan_regs settings:
Resolution : 300DPI/300DPI
Lines : 1
PPL : 2600
Startpos : 0/0
Depth/Channels: 16/3
Flags : 37
[genesys_gl841] gl841_init_scan_regs : stagger=0 lines
[genesys_gl841] gl841_init_scan_regs : exposure_time=5320 pixels
[genesys_gl841] gl841_init_scan_regs: move=0 steps
[genesys_gl841] gl841_init_scan_regs: move=0 steps
[genesys_gl841] gl841_init_scan_regs: physical bytes to read = 31200
[genesys_gl841] gl841_init_scan_regs: total bytes to send = 54532764
[genesys_gl841] gl841_offset_calibration: starting first line reading
[genesys_gl841] gl841_offset_calibration: black/white pixels: 5200/0,5200/0,5200/0
[genesys_gl841] gl841_offset_calibration: starting first line reading
[genesys] sanei_genesys_read_data_from_scanner: timeout, buffer does not get filled
[genesys] genesys_flatbed_calibration: offset calibration failed: Error during device I/O
[genesys] genesys_start_scan: failed to do flatbed calibration: Error during device I/O
scanimage: sane_start: Error during device I/O
[genesys_gl841] gl841_slow_back_home: already at home, completed
[barci@barcipc ~]$
The first line assuming something went wrong is "timeout, buffer does not get filled". The only relevant google result I found is the source code of the genesys backend. I haven't a clue what next. Any suggestions?
Meanwhile I started two further debugging lines:
1. With the Mandriva Live CD I tried to find out with lsmod which modules are loaded exactly when I plug the scanner; they were parport_pc, ppdev and parport, but loading them manually under Arch didn't help. They handle parallel port devices, are they relevant in case of a USB device?
2. I issued "udevadm monitor --env" + plug scanner + unplug scanner + Ctrl+C both under Live CD and Arch. Under Arch all blocks containg the line "SUBSYSTEM=usb_endpoint" were missing.
Here is a sample of this kind of blocks I see under Mandriva:
UDEV [1256502201.043944] add /devices/pci0000:00/0000:00:10.4/usb5/5-4/5-4:1.0/usb_endpoint/usbdev5.4_ep83 (usb_endpoint)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:10.4/usb5/5-4/5-4:1.0/usb_endpoint/usbdev5.4_ep83
SUBSYSTEM=usb_endpoint
SEQNUM=1580
DEVNAME=/dev/usbdev5.4_ep83
MAJOR=252
MINOR=15
DEVLINKS=/dev/char/252:15
Thank you in advance.