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--- docs:scanners [2010-04-15 13:12]
Mateusz Korniak My notes over scanners config
+++ docs:scanners [2010-04-15 14:37] (current)
Mateusz Korniak All I needed to run two my scanners.
@@ Line 19: / Line 19: @@
 <file> /usr/sbin/lsusb
 </file>
-Plug in scanner, check /var/log/kernel for sth similar to:
+Plug in scanner, check ///var/log/kernel// for sth similar to:
 <file>Apr 15 10:34:27 laptop-hp kernel: [ 8122.892835] usb 2-1: new full speed USB device using ohci_hcd and address 4
@@ Line 29: / Line 29: @@
 or run lsusb again and notice new device.
+==== Testing if sane recognizes scanner ====
+Run (first from user account and later via sudo)
+<file>sane-find-scanner
+</file>
+One should see:
+<file>found USB scanner (vendor=0x055f, product=0x021b, chip=GT-6816?) at libusb:002:004
+</file>
+If there is also information
+<file>libusb couldn't open USB device /dev/bus/usb/002/004: Permission denied.
+libusb requires write access to USB device nodes.
+</file>
+meaning there is privilages problem
+==== Solving /dev/bus/usb/*/* privilages problem ====
+If device being scanner has root:root privilates:
+<file>crw-rw-r-- 1 root root 189, 131 Apr 15 10:43 /dev/bus/usb/002/004
+</file>
+regular users will not be able to use scanner device.
+Option is adding new udev rule to file ///etc/udev/rules.d/41-libsane-local.rules// which will deal with adding scanner device.
+Selection criteria can be found from issuing command (after using proper usb bus numbers 2.4 in example):
+<file>udevadm info -a --name /dev/usbdev2.4
+</file>
+or monitoring udev events (with properties display) during device plugin
+<file>udevadm monitor --property
+</file>
+Most likely criteria would be SYSFS{idVendor}== and SYSFS{idProduct} so rule migh look like:
+<file>SYSFS{idVendor}=="055f", SYSFS{idProduct}=="021b", MODE="0664", GROUP="scanner", ENV{libsane_matched}="yes"
+</file>
+Reload udev rules:
+<file>udevadm control --reload-rules
+</file>
+and unplug, plug device or trigger all rules again:
+<file>udevadm trigger
+</file>
+and verify results.
+Note that we here try to use non-existing in PLD group 'scanner' but somehow rule works for me (udev-151, kernel-2.6.32.8) and something (TODO: what? by what criteria ?) adding currenly logged in on Xconsole user ? to device acl, so  'getfacl /dev/bus/usb/003/009' returns:
+<file># file: 003/009
+# owner: root
+# group: root
+user::rw-
+user:matkor:rw-
+group::rw-
+mask::rw-
+other::r--
+</file>
+and device is accesible (rw) for user 'matkor'.
+Of course if above does not work, one can select any group 'usb', 'users' etc to be added for device.
+==== Firmware files needed for scanner models ====
+Sometimes firmware file must be loaded to scanner before using it but required file(s) are not included with sane and must be downloaded from drivers/webpages. Run xsane from console and observere which files seems be needed for given scanner device.
+==== Clients: xsane ====

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