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Scanner is only detected with root user, printer cannot be added through

From: divoplade
Subject: Scanner is only detected with root user, printer cannot be added through GNOME
Date: Fri, 05 Mar 2021 21:21:09 +0100
User-agent: Evolution 3.34.2

Dear guix,

When running simple-scan, 

$ LANG=C simple-scan

I get a dialog showing "No scanners detected".

However, when I run the same with sudo,

$ LANG=C sudo simple-scan

I don’t get the icons, but the scanner is detected and usable.

I am currently in the following supplementary-groups:

'("wheel" "netdev" "audio" "video" "lpadmin" "scanner")

Is it not enough?

$ hp-scan -ldebug

I get:
HP Linux Imaging and Printing System (ver. 3.20.11)
Scan Utility ver. 2.2

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

hp-scan[9905]: debug: getDeviceUri(None, None, ['hpaio'], {'scan-type': 
(<built-in function gt>, 0)}, , True)
hp-scan[9905]: debug: Mode=0
error: No device selected/specified or that supports this

Also, when I try to add it as a printer in the GNOME control center, I
can select the printer but then I get a dialog "Failed to add new
printer.", with a console message that seems relevant: 

(gnome-control-center:9651): printers-cc-panel-WARNING **:
21:08:07.779: cups-pk-helper: addition of printer Deskjet-2050-J510
failed: cups-authentication-canceled

What do I do wrong? What can I do to debug it?

Best regards,


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