diff --git a/src/i830_display.c b/src/i830_display.c
index 5e52aac..2836c66 100644
--- a/src/i830_display.c
+++ b/src/i830_display.c
@@ -372,8 +372,8 @@ i830FindBestPLL(xf86CrtcPtr crtc, int target, int refclk, intel_clock_t *best_cl
 void
 i830WaitForVblank(ScrnInfoPtr pScreen)
 {
-    /* Wait for 20ms, i.e. one cycle at 50hz. */
-    usleep(30000);
+    /* Wait for 300ms */
+    usleep(300000);
 }
 
 void
diff --git a/src/i830_driver.c b/src/i830_driver.c
index a19c8eb..6125f83 100644
--- a/src/i830_driver.c
+++ b/src/i830_driver.c
@@ -2047,7 +2047,7 @@ SaveHWState(ScrnInfoPtr pScrn)
 static void
 i830_dpll_settle(void)
 {
-    usleep(10000); /* 10 ms *should* be plenty */
+    usleep(300000); /* 300 ms *should* be plenty */
 }
 
 static Bool