SANE not detecting scanner by ID (pipe error) or path (invalid arg)

I have a Canon P-208II, which uses the canon_dr backend [0].

However, I noticed from lsusb that the product ID of mine (0x1660) differs from that in /etc/sane.d/canon_dr.conf and /usr/lib/udev/rules/49-sane.rules (0x165f), so I duplicated those lines, modifying the ID to match.

$ lsusb
Bus 001 Device 017: ID 1083:1660 Canon Electronics, Inc. CANON   P-208II

Despite that, neither sane-find-scanner nor scanimage -L detect the scanner, with verbose logging I can see it trying to access and getting permissions errors, or with root:

could not fetch string descriptor: Pipe error

in the same location.

I also tried sane-find-scanner /dev/usb/001/017, which says failed to open (Invalid argument) – I’m not sure what else to give as ‘devname’ [1]?

Is there somewhere else I need to change the product ID, or something to do to make the changes I have made take effect? Or is the pipe error a smoking gun?

[0] –

[1] –

Go to Source
Author: OJFord