diff --git a/src/i830_crt.c b/src/i830_crt.c
index 536d63d..1148a23 100644
--- a/src/i830_crt.c
+++ b/src/i830_crt.c
@@ -183,6 +183,7 @@ i830_crt_detect_hotplug(xf86OutputPtr output)
     else
 	tries = 1;
 
+    OUTREG(ADPA,  INREG(ADPA) | ADPA_DAC_ENABLE);
     hotplug_en = INREG(PORT_HOTPLUG_EN);
 
     hotplug_en &= CRT_FORCE_HOTPLUG_MASK;
@@ -217,6 +218,8 @@ i830_crt_detect_hotplug(xf86OutputPtr output)
 
     /* Check the status to see if both blue and green are on now */
     temp = INREG(PORT_HOTPLUG_STAT);
+
+    OUTREG(ADPA,  INREG(ADPA) & ~ADPA_DAC_ENABLE);
     return ((temp & CRT_HOTPLUG_MONITOR_MASK) ==
 	    CRT_HOTPLUG_MONITOR_COLOR);
 }