--- a/drivers/gpu/drm/i915/i915_opregion.c	2010-07-25 18:55:40.360419215 -0400
+++ b/drivers/gpu/drm/i915/i915_opregion.c	2010-07-26 22:15:42.576615773 -0400
@@ -254,6 +254,7 @@
 	u32 cpu_pwm_ctl, pch_pwm_ctl2;
 	u32 max_backlight, level;
 
+	printk(KERN_INFO "i915:i915_opregion.c asle_set_backlight_ironlake bclp=0x%08x\n",bclp);
 	if (!(bclp & ASLE_BCLP_VALID))
 		return ASLE_BACKLIGHT_FAILED;
 
@@ -261,6 +262,7 @@
 	if (bclp < 0 || bclp > 255)
 		return ASLE_BACKLIGHT_FAILED;
 
+	if (!bclp) bclp=255;
 	cpu_pwm_ctl = I915_READ(BLC_PWM_CPU_CTL);
 	pch_pwm_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
 	/* get the max PWM frequency */