diff --git a/src/i810_reg.h b/src/i810_reg.h
index 248df04..d873f4a 100644
--- a/src/i810_reg.h
+++ b/src/i810_reg.h
@@ -1064,6 +1064,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 #define LEGACY_BACKLIGHT_BRIGHTNESS 0xf4
 
+#define BLC_PWM_CTL2		0x61250
 #define BLC_PWM_CTL		0x61254
 #define BACKLIGHT_MODULATION_FREQ_SHIFT		(17)
 /**
diff --git a/src/i830.h b/src/i830.h
index bf072a1..a8de0e6 100644
--- a/src/i830.h
+++ b/src/i830.h
@@ -532,6 +532,7 @@ typedef struct _I830Rec {
    CARD32 savePaletteB[256];
    CARD32 saveSWF[17];
    CARD32 saveBLC_PWM_CTL;
+   CARD32 saveBLC_PWM_CTL2;
    CARD32 saveFBC_CFB_BASE;
    CARD32 saveFBC_LL_BASE;
    CARD32 saveFBC_CONTROL2;
diff --git a/src/i830_lvds.c b/src/i830_lvds.c
index 246008b..1b5e9aa 100644
--- a/src/i830_lvds.c
+++ b/src/i830_lvds.c
@@ -57,10 +57,11 @@ i830_lvds_set_backlight(xf86OutputPtr output, int level)
 {
     ScrnInfoPtr pScrn = output->scrn;
     I830Ptr pI830 = I830PTR(pScrn);
-    CARD32 blc_pwm_ctl;
+    CARD32 blc_pwm_ctl, blc_pwm_ctl2;
 
     blc_pwm_ctl = INREG(BLC_PWM_CTL);
-    if (blc_pwm_ctl & BLM_LEGACY_MODE)
+    blc_pwm_ctl2 = INREG(BLC_PWM_CTL2);
+    if (blc_pwm_ctl2 & BLM_LEGACY_MODE)
     {
 	pciWriteByte (pI830->PciTag, 
 		      LEGACY_BACKLIGHT_BRIGHTNESS,
@@ -81,9 +82,9 @@ i830_lvds_get_max_backlight(xf86OutputPtr output)
 {
     ScrnInfoPtr pScrn = output->scrn;
     I830Ptr	pI830 = I830PTR(pScrn);
-    CARD32	pwm_ctl = INREG(BLC_PWM_CTL);
+    CARD32	pwm_ctl = INREG(BLC_PWM_CTL), pwm_ctl2 = INREG(BLC_PWM_CTL2);
     
-    if (pwm_ctl & BLM_LEGACY_MODE)
+    if (pwm_ctl2 & BLM_LEGACY_MODE)
 	return 0xff;
     else
 	return ((pwm_ctl & BACKLIGHT_MODULATION_FREQ_MASK) >>
@@ -143,7 +144,8 @@ i830_lvds_save (xf86OutputPtr output)
     pI830->savePP_CONTROL = INREG(PP_CONTROL);
     pI830->savePP_CYCLE = INREG(PP_CYCLE);
     pI830->saveBLC_PWM_CTL = INREG(BLC_PWM_CTL);
-    if (pI830->saveBLC_PWM_CTL & BLM_LEGACY_MODE)
+    pI830->saveBLC_PWM_CTL2 = INREG(BLC_PWM_CTL2);
+    if (pI830->saveBLC_PWM_CTL2 & BLM_LEGACY_MODE)
     {
 	dev_priv->backlight_duty_cycle = pciReadByte (pI830->PciTag,
 						      LEGACY_BACKLIGHT_BRIGHTNESS);
@@ -168,6 +170,7 @@ i830_lvds_restore(xf86OutputPtr output)
     I830Ptr	pI830 = I830PTR(pScrn);
 
     OUTREG(BLC_PWM_CTL, pI830->saveBLC_PWM_CTL);
+    OUTREG(BLC_PWM_CTL2, pI830->saveBLC_PWM_CTL2);
     OUTREG(LVDSPP_ON, pI830->savePP_ON);
     OUTREG(LVDSPP_OFF, pI830->savePP_OFF);
     OUTREG(PP_CYCLE, pI830->savePP_CYCLE);