From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Disable discrete graphics card (Nvidia)
Date: Sat, 07 Apr 2018 23:51:40 +0200
Message-ID: <87d0zay9ar.fsf@gnu.org>
References: <87muyjph8y.fsf@gmail.com> <87zi2fh8yy.fsf@gmail.com>
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In-Reply-To: <87zi2fh8yy.fsf@gmail.com> (Pierre Neidhardt's message of "Sat,
	07 Apr 2018 11:08:29 +0530")
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To: Pierre Neidhardt <ambrevar@gmail.com>
Cc: help-guix <help-guix@gnu.org>

Hello,

Pierre Neidhardt <ambrevar@gmail.com> skribis:

> On my previous system (Void Linux), bbswitch did not seem to work
> either, but I remember that I fixed the issue by _uninstalling_
> xf86-video-nouveau.

Rather than thinking in terms of =E2=80=9Cuninstalling=E2=80=9D xf86-video-=
nouveau, you
have to think in terms of which drivers are loaded by the Xorg server.
See =E2=80=98%default-xorg-modules=E2=80=99 in (gnu services xorg).

What you could do is something along these lines (untested):

  (operating-system
     ;; =E2=80=A6
     (services (modify-services %desktop-services
                 (slim-service-type config
                  =3D> (slim-configuration
                       (inherit config)
                       (startx (xorg-start-command
                                #:modules my-xorg-modules)))))))

where:

  (define my-xorg-modules
    ;; Everything but Nouveau.
    (delete xf86-video-nouveau %default-xorg-modules))

HTH!

Ludo=E2=80=99.