drm/i915: Disable VGA output when doing DRM_MODE_DPMS_OFF.

Signed-off-by: NMa Ling <ling.ma@intel.com>
Signed-off-by: NEric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/intel_crt.c

@@ -46,7 +46,7 @@ static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
 
 	temp = I915_READ(reg);
 	temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
-	temp |= ADPA_DAC_ENABLE;
+	temp &= ~ADPA_DAC_ENABLE;
 
 	switch(mode) {
 	case DRM_MODE_DPMS_ON: