amd-hybrid-graphics module: remove

This was only applicable to very specific hardware, and the only person
with an apparent interest in maintaining it (me) no longer uses the
hardware in question.

nixos/doc/manual/release-notes/rl-1803.xml

@@ -144,6 +144,11 @@ following incompatible changes:</para>
       will be accessible at <literal>/run/memcached/memcached.sock</literal>.
     </para>
   </listitem>
+  <listitem>
+    <para>
+      The <varname>hardware.amdHybridGraphics.disable</varname> option was removed for lack of a maintainer. If you still need this module, you may wish to include a copy of it from an older version of nixos in your imports.
+    </para>
+  </listitem>
 </itemizedlist>
 
 </section>

nixos/modules/module-list.nix

@@ -225,7 +225,6 @@
   ./services/games/terraria.nix
   ./services/hardware/acpid.nix
   ./services/hardware/actkbd.nix
-  ./services/hardware/amd-hybrid-graphics.nix
   ./services/hardware/bluetooth.nix
   ./services/hardware/brltty.nix
   ./services/hardware/freefall.nix

nixos/modules/services/hardware/amd-hybrid-graphics.nix

@@ -1,46 +0,0 @@
-{ config, pkgs, lib, ... }:
-
-{
-
-  ###### interface
-
-  options = {
-
-    hardware.amdHybridGraphics.disable = lib.mkOption {
-      default = false;
-      type = lib.types.bool;
-      description = ''
-        Completely disable the AMD graphics card and use the
-        integrated graphics processor instead.
-      '';
-    };
-
-  };
-
-
-  ###### implementation
-
-  config = lib.mkIf config.hardware.amdHybridGraphics.disable {
-    systemd.services."amd-hybrid-graphics" = {
-      path = [ pkgs.bash ];
-      description = "Disable AMD Card";
-      after = [ "sys-kernel-debug.mount" ];
-      before = [ "systemd-vconsole-setup.service" "display-manager.service" ];
-      requires = [ "sys-kernel-debug.mount" "vgaswitcheroo.path" ];
-      serviceConfig = {
-        Type = "oneshot";
-        RemainAfterExit = true;
-        ExecStart = "${pkgs.bash}/bin/sh -c 'echo -e \"IGD\\nOFF\" > /sys/kernel/debug/vgaswitcheroo/switch'";
-        ExecStop = "${pkgs.bash}/bin/sh -c 'echo ON >/sys/kernel/debug/vgaswitcheroo/switch'";
-      };
-    };
-    systemd.paths."vgaswitcheroo" = {
-      pathConfig = {
-        PathExists = "/sys/kernel/debug/vgaswitcheroo/switch";
-        Unit = "amd-hybrid-graphics.service";
-      };
-      wantedBy = ["multi-user.target"];
-    };
-  };
-
-}