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From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041111 Firefox/1.0 Description of problem: sane-find-scanner shows: found USB scanner (vendor=0x04b8 [EPSON], product=0x0110 [EPSON Scanner]) at libusb:001:003 for both root and non-root user. scanimage -L shows: device `epson:libusb:001:003' is a Epson GT-8200 flatbed scanner for root but: No scanners were identified. for non-root user. scanimage -d epson:libusb:001:003>image produces image for root user but scanimage: open of device epson:libusb:001:003 failed: Invalid argument for non-root user. Version-Release number of selected component (if applicable): sane-backends-1.0.14-6 How reproducible: Always Steps to Reproduce: 1. Log in as non-root user 2. Attach and power-on Epson USB scanner 3. Run scanimage -L Actual Results: No scanners were identified Expected Results: device `epson:libusb:001:003' is a Epson GT-8200 flatbed scanner Additional info:
I'm having the same problem with HP PSC 2175 scanner.
Scanner ownership and permissions are defined in /etc/udev/permissions.d/50-udev.permissions. Ownership should belong to console user. A work around, since I don't know how to fix ownership, is to set permissions for usb/scanner* to 0666.
What about when you switch off, and then on, the scanner?
No switch on scanner, but disconnecting and reconnecting either power or usb cable make the scanner accessable to a non-root user. My earlier observation about permissions was probably a misinterpretation of steps that I took to get the scanner working. On one of many tests the scanner was accessable without having to disconnect and reconnect it.
*** This bug has been marked as a duplicate of 121511 ***