Merge pull request #28772 from grahamc/issue-20189-libinput

Enable libinput in the installer and start deprecating synaptics

nixos/doc/manual/release-notes/rl-1709.xml

···
       removed. The system support had been broken for several years.
     </para>
   </listitem>
+  <listitem>
+    <para>
+      Touchpad support should now be enabled through
+      <literal>libinput</literal> as <literal>synaptics</literal> is
+      now deprecated. See the option
+      <literal>services.xserver.libinput.enable</literal>.
+    </para>
+  </listitem>
 </itemizedlist>
 
 <para>Other notable improvements:</para>

nixos/modules/installer/tools/nixos-generate-config.pl

···
   # services.xserver.layout = "us";
   # services.xserver.xkbOptions = "eurosign:e";
 
+  # Enable touchpad support.
+  # services.xserver.libinput.enable = true;
+
   # Enable the KDE Desktop Environment.
   # services.xserver.displayManager.sddm.enable = true;
   # services.xserver.desktopManager.plasma5.enable = true;

nixos/modules/profiles/graphical.nix

···
     enable = true;
     displayManager.sddm.enable = true;
     desktopManager.plasma5.enable = true;
-    synaptics.enable = true; # for touchpad support on many laptops
+    libinput.enable = true; # for touchpad support on many laptops
   };
 
   environment.systemPackages = [ pkgs.glxinfo ];

nixos/modules/services/x11/hardware/synaptics.nix

···
       enable = mkOption {
         type = types.bool;
         default = false;
-        description = "Whether to enable touchpad support.";
+        description = "Whether to enable touchpad support. Deprecated: Consider services.xserver.libinput.enable.";
       };
 
       dev = mkOption {