From 651686626f7b9b3ab7b2102770c216c5fbb69f8a Mon Sep 17 00:00:00 2001
From: Mathijs Kwik <mathijs@bluescreen303.nl>
Date: Sat, 24 Aug 2013 11:38:32 +0200
Subject: [PATCH] convert bbswitch job to systemd unit

dramatically speeds up my boot time because it was the last
service (for me) that depended on udev-settle.service

udev-settle isn't needed for modern system initialization but some
oldschool services (mdadm/lvm/cryptsetup) depend on it so they can
just enumerate devices instead of having to react to changes
dynamically. In NixOS these things are usually already taken care of
during stage 1 (early ramdisk) if you use them.
---
 modules/services/hardware/nvidia-optimus.nix | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/modules/services/hardware/nvidia-optimus.nix b/modules/services/hardware/nvidia-optimus.nix
index fd58b3d5ad52..79eb92c2f04d 100644
--- a/modules/services/hardware/nvidia-optimus.nix
+++ b/modules/services/hardware/nvidia-optimus.nix
@@ -27,13 +27,17 @@ in
     boot.kernelModules = [ "bbswitch" ];
     boot.extraModulePackages = [ kernel.bbswitch ];
 
-    jobs.bbswitch = {
-      name = "bbswitch";
+    systemd.services.bbswitch = {
       description = "turn off nvidia card";
-      startOn = "stopped udevtrigger";
-      exec = "discrete_vga_poweroff";
-      path = [kernel.bbswitch];
-      task = true;
+      after = [ "sysinit.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        Type = "oneshot";
+        RemainAfterExit = true;
+        ExecStart = "${kernel.bbswitch}/bin/discrete_vga_poweroff";
+        ExecStop = "${kernel.bbswitch}/bin/discrete_vga_poweron";
+      };
+      path = [ kernel.bbswitch ];
     };
   };