diff --git a/src/radeon_driver.c b/src/radeon_driver.c
index 2288126..2d7fd29 100644
--- a/src/radeon_driver.c
+++ b/src/radeon_driver.c
@@ -2045,7 +2045,12 @@ static Bool RADEONPreInitModes(ScrnInfoPtr pScrn, xf86Int10InfoPtr pInt10)
 	if (ven && ven->prod_id == 0x029a && ven->serial == 0x01010101)
 	    info->ddc_mode = TRUE;
     }
-
+    /*disable RMX for all Dell Servers with RN50 chips*/
+    if((info->Chipset == PCI_CHIP_RN50_515E || info->Chipset == PCI_CHIP_RN50_5969)
+           && info->PciInfo->subsysVendor == PCI_VENDOR_DELL){
+       info->ddc_mode = TRUE;
+   }
+    
     xf86DrvMsg(pScrn->scrnIndex, X_INFO,
 	       "Validating modes on %s head ---------\n",
 	       info->IsSecondary ? "Secondary" : "Primary");