Fix initial DDC parameters when validating modes.

src/i830_driver.c

@@ -2652,8 +2652,6 @@ I830BIOSPreInit(ScrnInfoPtr pScrn, int flags)
       xf86SetDDCproperties(pScrn, pI830->vesa->monitor);
    xf86UnloadSubModule(pDDCModule);
 
-   DDCclock = I830UseDDC(pScrn);
-
    /* XXX Move this to a header. */
 #define VIDEO_BIOS_SCRATCH 0x18
 
@@ -2755,6 +2753,8 @@ I830BIOSPreInit(ScrnInfoPtr pScrn, int flags)
       defmon |= 2;
    }
 
+   DDCclock = I830UseDDC(pScrn);
+
    /*
     * Note: VBE modes (> 0x7f) won't work with Intel's extended BIOS
     * functions.  For that reason it's important to set only