commit 29e0e180729a4f0cc020985a4de4c8bc4b9c7f5f
Author: Keith Packard <keithp@koto.keithp.com>
Date:   Mon Oct 22 13:38:16 2007 -0700

    Leave hardware-specified preferred modes alone when user preference exists.
    
    Instead of removing the preference bit marking the hardware declared mode
    preference, leave it in place and just move the user preferred mode to the
    front of the list while marking it with the USERPREF bit which will cause it
    to be selected by the initial mode selection code.

diff --git a/hw/xfree86/modes/xf86Crtc.c b/hw/xfree86/modes/xf86Crtc.c
index 0a48d5b..bb416fd 100644
--- a/hw/xfree86/modes/xf86Crtc.c
+++ b/hw/xfree86/modes/xf86Crtc.c
@@ -1417,9 +1417,8 @@ xf86ProbeOutputModes (ScrnInfoPtr scrn, int maxX, int maxY)
 			output->probed_modes = mode;
 		    }
 		    mode->type |= (M_T_PREFERRED|M_T_USERPREF);
+		    break;
 		}
-		else
-		    mode->type &= ~M_T_PREFERRED;
 	    }
 	}