doc: Document 'display' and 'vt' fields of 'slim-configuration'.

* doc/guix.texi (X Window): Mention 'display' and 'vt' fields of
  'slim-configuration' and explain how to use them to add multiple SLiM
  services to system services.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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Diego Nicola Barbato 2019-04-28 22:18:28 +02:00 committed by Ludovic Courtès
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@ -13485,6 +13485,33 @@ This is the type for the SLiM graphical login manager for X11.
Like GDM, SLiM looks for session types described by @file{.desktop} files and
allows users to choose a session from the log-in screen using @kbd{F1}. It
also honors @file{~/.xsession} files.
Unlike GDM, SLiM does not spawn the user session on a different VT after
logging in, which means that you can only start one graphical session. If you
want to be able to run multiple graphical sessions at the same time you have
to add multiple SLiM services to your system services. The following example
shows how to replace the default GDM service with two SLiM services on tty7
and tty8.
@lisp
(use-modules (gnu services)
(gnu services desktop)
(gnu services xorg)
(srfi srfi-1)) ;for 'remove'
(operating-system
;; ...
(services (cons* (service slim-service-type (slim-configuration
(display ":0")
(vt "vt7")))
(service slim-service-type (slim-configuration
(display ":1")
(vt "vt8")))
(remove (lambda (service)
(eq? (service-kind service) gdm-service-type))
%desktop-services))))
@end lisp
@end defvr
@deftp {Data Type} slim-configuration
@ -13522,6 +13549,12 @@ false, you will be unable to log in.
@item @code{xorg-configuration} (default @code{(xorg-configuration)})
Configuration of the Xorg graphical server.
@item @code{display} (default @code{":0"})
The display on which to start the Xorg graphical server.
@item @code{vt} (default @code{"vt7"})
The VT on which to start the Xorg graphical server.
@item @code{xauth} (default: @code{xauth})
The XAuth package to use.