try this: SANE_DEBUG_SANEI_USB=255 scanimage -L
then look thru that output. do you see a line like this: [sanei_usb] sanei_usb_init: Looking for kernel scanner devices what comes immediately after that? allan On Tue, 2 May 2006, Peter Christy wrote: > On Tuesday 02 May 2006 17:40, m. allan noah wrote: >> i am confused by this- first you say that you need sane to look under >> /sys or /dev for devices, then you say that you have to alter permissions >> to get it working. which is it? > > udev mounts the usbscanner under /sys In my case, under /sys/bus/usb/ and then > a randomly variable point. However, given the relevant vendor and product > IDs, it will automatically create a symlink in /dev and set all the relevant > permissions. > > So for example, I can make it produce a /dev/usbscanner symlink that will > always point to the scanner, wherever it may have appeared on > the /sys/bus/usb/ directory, and have the right permissions. > > However, sane appears to be looking for the scanner > under /proc/bus/usb/whatever, which udev cannot easily (as far as I can see) > set the permissions. As in the /sys file system, it seems to be somewhat > random where it pops up, from one reboot to the next, although the location > does correspond to the location under /sys. > > Even hotplug was incapable of setting the permissions automatically, because > although my scanner always appeared as /proc/bus/usb/002/002, hotplug > *always* tried to set the permissions for /proc/bus /usb/001/002! This was a > bug in hotplug that never got fixed! I bypassed it by adding > > chown root:users /proc/bus/usb/002/002 > chmod 0660 /proc/bus/usb/002/002 > > to my rc.local file. However, this only works if the scanner always appears > on /proc/bus/usb/002/002 Under udev alone, it doesn't. As often as not it > appears as /proc/bus/usb/001/003 or even something else! > > I need to find some way of making sane use /dev/usbscanner to access the > scanner rather than /proc/bus/usb/whatever. My understanding is that this is > a very old way of doing things that only works with kernel scanner modules. > Certainly my initial attempts in this area have met with total failure! > > -- "so don't tell us it can't be done, putting down what you don't know. money isn't our god, integrity will free our souls" - Max Cavalera
