--- gspcav1-20071224/Pixart/pac7311.h	2007-05-08 15:54:20.000000000 +0200
+++ gspcav1-20071224.bmw1/Pixart/pac7311.h	2008-03-23 20:26:57.000000000 +0100
@@ -115,7 +115,7 @@
 
 static void pac7311_setbrightness(struct usb_spca50x *spca50x)
 {
-    __u8 brightness = (spca50x->brightness >> 8) * -1;
+    __u8 brightness = ~(spca50x->brightness >> 8) -1;
     pac7311_reg_write(spca50x->dev, 0xff, 0x04);
     //pac7311_reg_write(spca50x->dev, 0x0e, 0x00);
     pac7311_reg_write(spca50x->dev, 0x0f, brightness);