Re: Unable to find wireless printer/scanner (Canon Pixma MG2950) on Guix.

[Luigi Salamone <lg.salamone@gmail.com>]

Thanks!

Yes, I have '(name-service-switch %mdns-host-lookup-nss)' in my
/etc/config.scm.

Now...as for the scanner:
On Parabola I need to edit the file /etc/sane/pixma.conf (not present in
Guix) to add such a line: bjnp://MyPixmaPrinter.local. See
https://wiki.archlinux.org/title/SANE/Scanner-specific_problems#Canon
I also edit the file /etc/nsswitch.conf as indicated here:
https://wiki.archlinux.org/title/Avahi#Using_Avahi.

As for the printer:
I need the gutenprint drivers, which are not packaged for Guix. I've seen a
patch for this: https://issues.guix.gnu.org/45725
But unfortunately I have no idea which file to patch.

Greetings!
Luigi

On Sat, Mar 11, 2023 at 8:55 AM Guillaume Le Vaillant <glv@posteo.net>
wrote:

> Luigi Salamone <lg.salamone@gmail.com> skribis:
>
> > Hi!
> >
> > My Canon Pixma MG2950 works fine on Parabola, after configuring avahi
> with
> > nss-mdns. But on Guix I can't find neither the printer nor the scanner.
> > Tried with "system-config-printer" and via "lpinfo". What can I do? Here
> > the salient lines of my /etc/config.scm:
> >
> > ...
> > (use-package-modules cups scanner)
> > ....
> >
> >  (packages (append (list (specification->package "cups")
> >                          (specification->package "cups-filters")
> >                          (specification->package "cups-filters")
> >                          (specification->package "cups-pk-helper")
> >                          (specification->package "foomatic-filters")
> >                          (specification->package "ghostscript")
> >                          (specification->package "sane-backends")
> >                          (specification->package "simple-scan")
> >                          (specification->package "nss-mdns")
> >                          (specification->package "avahi")
> > ....
> > (services
> >   (const* (service cups-service-type
> >                     (cups-configuration
> >                       (extensions
> >                         (list cups-filters foomatic-filters hplip))
> >                       (web-interface? #t)
> >                       (default-paper-size "A4")))
> >      (modify-services %desktop-services
> >                         (sane-service-type _ =>
> >                                            sane-backends)
> >
> > Thanks!
> >
> > Luigi
>
> Hi,
>
> Did you put '(name-service-switch %mdns-host-lookup-nss)' in your
> 'operating-system' definition to activate name resolution using mDNS?
>
> There's a chapter about it in the manual:
> https://guix.gnu.org/manual/en/html_node/Name-Service-Switch.html
>