diff -ur nvclock0.8b4-old/src/backend/nv50.c nvclock0.8b4/src/backend/nv50.c
--- nvclock0.8b4-old/src/backend/nv50.c	2009-01-04 11:46:39.000000000 +0100
+++ nvclock0.8b4/src/backend/nv50.c	2009-04-20 22:58:08.176896700 +0200
@@ -249,7 +249,7 @@
 	int val;
 	if(level < 15 || level > 100)
 		return;
-	val = (level * 1024 / 100) | NV_PDIPSLAY_SOR0_REGS_BRIGHTNESS_CONTROL_ENABLED;
+	val = (level * 1024 / 100 + 1) | NV_PDIPSLAY_SOR0_REGS_BRIGHTNESS_CONTROL_ENABLED;
 	nv_card->PDISPLAY[NV_PDISPLAY_SOR0_REGS_BRIGHTNESS/4] = val;
 }