Category: usb

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mouse and keyboard not working on Ubuntu 20.04

I’m sorry I’m new to Ubuntu so I’ll try be as descriptive as possible.
At the moment my mouse is working when plugged into a specific USB port on the back of my PC. However when I move it to another port it doesn’t work. If I plug my keyboard into this same USB port then the keyboard will work and the mouse won’t. I have my system on a dual boot at the moment and I know for a fact that both the mouse and keyboard do work, it’s only when I reach the login screen that I have issues with my keyboard/mouse. I have tried other solutions given on this site and elsewhere but they don’t seem to work.
Like I said I’m new to Ubuntu and Linux as a whole so I’m sorry if this is an obvious question.

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Author: Alexander Hunter

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] – http://www.sane-project.org/sane-mfgs.html

[1] – http://www.sane-project.org/man/sane-find-scanner.1.html

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Author: OJFord