doc: Document sessions and ~/.xsession for SLiM.

* gnu/services/xorg.scm (slim-service): Document session types and
  ~/.xsession.
* doc/guix.texi (X Window): Adjust accordingly.

1 files changed, 13 insertions, 0 deletions

diff --git a/gnu/services/xorg.scm b/gnu/services/xorg.scm
index 8fd003f96a..4821614ba2 100644
--- a/gnu/services/xorg.scm
+++ b/gnu/services/xorg.scm
@@ -207,6 +207,19 @@ which should be passed to this script as the first argument.  If not, the
 turn starts the X display server with @var{startx}, a command as returned by
 @code{xorg-start-command}.
 
+@cindex X session
+
+SLiM automatically looks for session types described by the @file{.desktop}
+files in @file{/run/current-system/profile/share/xsessions} and allows users
+to choose a session from the log-in screen using @kbd{F1}.  Packages such as
+@var{xfce}, @var{sawfish}, and @var{ratpoison} provide @file{.desktop} files;
+adding them to the system-wide set of packages automatically makes them
+available at the log-in screen.
+
+In addition, @file{~/.xsession} files are honored.  When available,
+@file{~/.xsession} must be an executable that starts a window manager
+and/or other X clients.
+
 When @var{allow-empty-passwords?} is true, allow logins with an empty
 password.  When @var{auto-login?} is true, log in automatically as
 @var{default-user} with @var{auto-login-session}.