* With "nixos-rebuild build-vm", override the video driver of

the host (since e.g. "nvidia" won't work in the VM).

svn path=/nixos/trunk/; revision=16663

modules/virtualisation/qemu-vm.nix

@@ -126,4 +126,9 @@ in
     ''
       EnableSendFile Off
     '';
+
+  # When building a regular system configuration, override whatever
+  # video driver the host uses.
+  services.xserver.videoDriver = pkgs.lib.mkOverride 50 {} "vesa";
+  services.xserver.defaultDepth = pkgs.lib.mkOverride 50 {} 16;
 }