[PATCH] Fix xrandr backlight brightness control on 64 bit Linux. The display brightness property is a 32 bit integer, using a long doesn't work on 64 bit build.

[Marcus Overhagen]

---
 common/xfpm-brightness.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/common/xfpm-brightness.c b/common/xfpm-brightness.c
index aa1ef33..7e5470a 100644
--- a/common/xfpm-brightness.c
+++ b/common/xfpm-brightness.c
@@ -96,7 +96,7 @@ xfpm_brightness_xrandr_get_level (XfpmBrightness *brightness, RROutput output, l
 {
     unsigned long nitems;
     unsigned long bytes_after;
-    long *prop;
+    unsigned char *prop;
     Atom actual_type;
     int actual_format;
     gboolean ret = FALSE;
@@ -105,7 +105,7 @@ xfpm_brightness_xrandr_get_level (XfpmBrightness *brightness, RROutput output, l
     if (XRRGetOutputProperty (GDK_DISPLAY (), output, brightness->priv->backlight,
 			      0, 4, False, False, None,
 			      &actual_type, &actual_format,
-			      &nitems, &bytes_after, ((unsigned char **)&prop)) != Success
+			      &nitems, &bytes_after, &prop) != Success
 	|| gdk_error_trap_pop () != 0)
     {
 	g_warning ("failed to get property");
@@ -114,7 +114,7 @@ xfpm_brightness_xrandr_get_level (XfpmBrightness *brightness, RROutput output, l
     
     if (actual_type == XA_INTEGER && nitems == 1 && actual_format == 32) 
     {
-	memcpy (current, prop, sizeof (*current));
+	*current = *(gint32 *) prop;
 	ret = TRUE;
     }
     
@@ -126,11 +126,12 @@ xfpm_brightness_xrandr_get_level (XfpmBrightness *brightness, RROutput output, l
 static gboolean
 xfpm_brightness_xrandr_set_level (XfpmBrightness *brightness, RROutput output, long level)
 {
+    gint32 prop = level;
     gboolean ret = TRUE;
 
     gdk_error_trap_push ();
     XRRChangeOutputProperty (GDK_DISPLAY (), output, brightness->priv->backlight, XA_INTEGER, 32,
-			     PropModeReplace, (unsigned char *) &level, 1);
+			     PropModeReplace, (unsigned char *) &prop, 1);
 			     
     XFlush (GDK_DISPLAY ());
     gdk_flush ();
-- 
1.8.1.2