diff --git a/src/i810_reg.h b/src/i810_reg.h
index 834b948..da12d6f 100644
--- a/src/i810_reg.h
+++ b/src/i810_reg.h
@@ -1120,6 +1120,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #define RENCLK_GATE_D2		0x6208
 #define RAMCLK_GATE_D		0x6210		/* CRL only */
+#define DEUC			0x6214          /* CRL only */
 
 /*
  * This is a PCI config space register to manipulate backlight brightness
diff --git a/src/i830_driver.c b/src/i830_driver.c
index ea37e6d..fcdb64a 100644
--- a/src/i830_driver.c
+++ b/src/i830_driver.c
@@ -1891,6 +1891,10 @@ SetHWOperatingState(ScrnInfoPtr pScrn)
       OUTREG(DSPCLK_GATE_D, VRHUNIT_CLOCK_GATE_DISABLE);
    } else if (IS_I965GM(pI830)) {
       OUTREG(RENCLK_GATE_D1, I965_RCC_CLOCK_GATE_DISABLE);
+      OUTREG(RENCLK_GATE_D2, 0);
+      OUTREG(DSPCLK_GATE_D, 0);
+      OUTREG(RAMCLK_GATE_D, 0);
+      OUTREG16(DEUC, 0);
    } else if (IS_I965G(pI830)) {
       OUTREG(RENCLK_GATE_D1,
 	     I965_RCC_CLOCK_GATE_DISABLE | I965_ISC_CLOCK_GATE_DISABLE);