diff -ur gnome-power-manager-2.19.6.clean/src/gpm-brightness-kbd.c gnome-power-manager-2.19.6/src/gpm-brightness-kbd.c
--- gnome-power-manager-2.19.6.clean/src/gpm-brightness-kbd.c	2007-06-01 09:16:08.000000000 +0100
+++ gnome-power-manager-2.19.6/src/gpm-brightness-kbd.c	2007-08-29 22:23:50.000000000 +0100
@@ -105,7 +105,7 @@
 
 	ret = dbus_g_proxy_call (proxy, "GetBrightness", &error,
 				 G_TYPE_INVALID,
-				 G_TYPE_UINT, brightness_level_hw,
+				 G_TYPE_INT, brightness_level_hw,
 				 G_TYPE_INVALID);
 	if (error) {
 		gpm_debug ("ERROR: %s", error->message);