Added the 'bbswitch' module, which is a more conventient module for powering off/on nvidia graphics cards than possible via the acpi_call module.

svn path=/nixpkgs/trunk/; revision=31840

pkgs/os-specific/linux/bbswitch/default.nix

@@ -0,0 +1,46 @@
+{ stdenv, fetchurl, kernel }:
+
+let
+
+  version = "0.4.1";
+  name = "bbswitch-${version}";
+
+in stdenv.mkDerivation {
+  inherit name;
+
+  src = fetchurl {
+    url = "http://github.com/downloads/Bumblebee-Project/bbswitch/${name}.tar.gz";
+    sha256 = "d579c6efc5f6482f0cf0b2c1b1f1a127413218cdffdc8f2d5a946c11909bda23";
+  };
+
+  preBuild = ''
+    kernelVersion=$(cd ${kernel}/lib/modules && ls)
+    substituteInPlace Makefile \
+      --replace "\$(shell uname -r)" "$kernelVersion" \
+      --replace "/lib/modules" "${kernel}/lib/modules"
+  '';
+ 
+  installPhase = ''
+    kernelVersion=$(cd ${kernel}/lib/modules && ls)
+    ensureDir $out/lib/modules/$kernelVersion/misc
+    cp bbswitch.ko $out/lib/modules/$kernelVersion/misc
+
+    ensureDir $out/bin
+    tee $out/bin/discrete_vga_poweroff << EOF
+    #!/bin/sh
+
+    echo -n OFF > /proc/acpi/bbswitch
+    EOF
+    tee $out/bin/discrete_vga_poweron << EOF
+    #!/bin/sh
+
+    echo -n ON > /proc/acpi/bbswitch
+    EOF
+    chmod +x $out/bin/discrete_vga_poweroff $out/bin/discrete_vga_poweron
+  '';
+
+  meta = {
+    platforms = stdenv.lib.platforms.linux;
+    description = "A module for powering off hybrid GPUs";
+  };
+}

pkgs/top-level/all-packages.nix

@@ -5814,6 +5814,8 @@ let
 
     acpi_call = callPackage ../os-specific/linux/acpi-call {};
 
+    bbswitch = callPackage ../os-specific/linux/bbswitch {};
+
     ati_drivers_x11 = callPackage ../os-specific/linux/ati-drivers { };
 
     aufs =