diff -urN gbm-0.30-1/gbm.c gbm-0.30-1.aoe/gbm.c
--- gbm-0.30-1/gbm.c	Thu Apr 26 17:23:00 2001
+++ gbm-0.30-1.aoe/gbm.c	Fri May 25 16:19:30 2001
@@ -24,6 +24,10 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
+// fbinv code pasted from Ross Vandegrifts code (ross@willow.seitz.cominserted)
+// found at http://poplar.seitz.com/~ross/agenda/ by Alexander Oelzant 
+// (aoe@mars.tuwien.ac.at)
+
 #include <unistd.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ -40,6 +44,8 @@
 
 extern int detach(int nochdir, int noclose);
 
+void fbinv(int fd, unsigned char c);
+
 #define DEBUG_GBM
 #define ON_SYNC "/etc/gbm/on_sync"
 
@@ -50,6 +56,14 @@
 // should the unit go to sleep when the pen is inserted?
 int hibernate_on_pen = 1;
 
+void
+swap (short *foo, short *bar)
+{
+  short temp = *foo;
+  *foo = *bar;
+  *bar = temp;
+}
+
 int echo(const char* s, const char* filename)
 {
 	int fd;
@@ -85,6 +99,28 @@
 	printf("gbm: set_backlight: %.2x\n", c);
 #endif
 	ioctl(fd, FBIOPUT_BACKLIGHT, c);
+	fbinv(fd,c);
+}
+
+void fbinv(int fd, unsigned char c)
+{
+  int invert;
+  int index;
+  unsigned short red [16], green [16], blue [16];
+  struct fb_cmap cmap = { 0, 16, red, green, blue, NULL };
+
+#ifdef DEBUG_GBM
+  printf("gbm: inverting: %.2x\n", c);
+#endif
+  ioctl (fd, FBIOGETCMAP, &cmap);
+
+  for (index = 0; index < 8; index ++)
+    {
+      swap (red + index, red + 15 - index);
+      swap (green + index, green + 15 - index);
+      swap (blue + index, blue + 15 - index);
+    }
+  ioctl (fd, FBIOPUTCMAP, &cmap);
 }
 
 int get_backlight(int fd)