diff --git a/hw/xfree86/common/xf86.h b/hw/xfree86/common/xf86.h
index e1f1b7051..a32aa9bcc 100644
--- a/hw/xfree86/common/xf86.h
+++ b/hw/xfree86/common/xf86.h
@@ -344,13 +344,14 @@ void xf86PruneDriverModes(ScrnInfoPtr scrp);
 void xf86SetCrtcForModes(ScrnInfoPtr scrp, int adjustFlags);
 void xf86PrintModes(ScrnInfoPtr scrp);
 void xf86ShowClockRanges(ScrnInfoPtr scrp, ClockRangePtr clockRanges);
-double xf86ModeHSync(DisplayModePtr mode);
-double xf86ModeVRefresh(DisplayModePtr mode);
+double xf86ModeHSync(const DisplayModeRec *mode);
+double xf86ModeVRefresh(const DisplayModeRec *mode);
 void xf86SetModeDefaultName(DisplayModePtr mode);
 void xf86SetModeCrtc(DisplayModePtr p, int adjustFlags);
-DisplayModePtr xf86DuplicateMode(DisplayModePtr pMode);
+DisplayModePtr xf86DuplicateMode(const DisplayModeRec *pMode);
 DisplayModePtr xf86DuplicateModes(ScrnInfoPtr pScrn, DisplayModePtr modeList);
-Bool xf86ModesEqual(DisplayModePtr pMode1, DisplayModePtr pMode2);
+Bool xf86ModesEqual(const DisplayModeRec *pMode1,
+		    const DisplayModeRec *pMode2);
 void xf86PrintModeline(int scrnIndex,DisplayModePtr mode);
 DisplayModePtr xf86ModesAdd(DisplayModePtr modes, DisplayModePtr new);
 
diff --git a/hw/xfree86/modes/xf86EdidModes.c b/hw/xfree86/modes/xf86EdidModes.c
index bea2f7e64..5ed61c1d0 100644
--- a/hw/xfree86/modes/xf86EdidModes.c
+++ b/hw/xfree86/modes/xf86EdidModes.c
@@ -418,7 +418,7 @@ MonitorStandardTimingLevel(xf86MonPtr DDC)
 }
 
 static int
-ModeRefresh(DisplayModePtr mode)
+ModeRefresh(const DisplayModeRec *mode)
 {
     return (int)(xf86ModeVRefresh(mode) + 0.5);
 }
@@ -432,7 +432,7 @@ static DisplayModePtr
 FindDMTMode(int hsize, int vsize, int refresh, Bool rb)
 {
     int i;
-    DisplayModePtr ret;
+    const DisplayModeRec *ret;
 
     for (i = 0; i < sizeof(DMTModes) / sizeof(DisplayModeRec); i++) {
 	ret = &DMTModes[i];
diff --git a/hw/xfree86/modes/xf86Modes.c b/hw/xfree86/modes/xf86Modes.c
index 0fdfbdb85..1522fa731 100644
--- a/hw/xfree86/modes/xf86Modes.c
+++ b/hw/xfree86/modes/xf86Modes.c
@@ -52,7 +52,7 @@ extern XF86ConfigPtr xf86configptr;
  * Exact copy of xf86Mode.c's.
  */
 _X_EXPORT double
-xf86ModeHSync(DisplayModePtr mode)
+xf86ModeHSync(const DisplayModeRec *mode)
 {
     double hsync = 0.0;
     
@@ -70,7 +70,7 @@ xf86ModeHSync(DisplayModePtr mode)
  * Exact copy of xf86Mode.c's.
  */
 _X_EXPORT double
-xf86ModeVRefresh(DisplayModePtr mode)
+xf86ModeVRefresh(const DisplayModeRec *mode)
 {
     double refresh = 0.0;
 
@@ -89,7 +89,7 @@ xf86ModeVRefresh(DisplayModePtr mode)
 }
 
 _X_EXPORT int
-xf86ModeWidth (DisplayModePtr mode, Rotation rotation)
+xf86ModeWidth (const DisplayModeRec *mode, Rotation rotation)
 {
     switch (rotation & 0xf) {
     case RR_Rotate_0:
@@ -104,7 +104,7 @@ xf86ModeWidth (DisplayModePtr mode, Rotation rotation)
 }
 
 _X_EXPORT int
-xf86ModeHeight (DisplayModePtr mode, Rotation rotation)
+xf86ModeHeight (const DisplayModeRec *mode, Rotation rotation)
 {
     switch (rotation & 0xf) {
     case RR_Rotate_0:
@@ -206,7 +206,7 @@ xf86SetModeCrtc(DisplayModePtr p, int adjustFlags)
  * Allocates and returns a copy of pMode, including pointers within pMode.
  */
 _X_EXPORT DisplayModePtr
-xf86DuplicateMode(DisplayModePtr pMode)
+xf86DuplicateMode(const DisplayModeRec *pMode)
 {
     DisplayModePtr pNew;
 
@@ -264,7 +264,7 @@ xf86DuplicateModes(ScrnInfoPtr pScrn, DisplayModePtr modeList)
  * This isn't in xf86Modes.c, but it might deserve to be there.
  */
 _X_EXPORT Bool
-xf86ModesEqual(DisplayModePtr pMode1, DisplayModePtr pMode2)
+xf86ModesEqual(const DisplayModeRec *pMode1, const DisplayModeRec *pMode2)
 {
      if (pMode1->Clock == pMode2->Clock &&
 	 pMode1->HDisplay == pMode2->HDisplay &&
@@ -519,7 +519,7 @@ xf86ValidateModesBandwidth(ScrnInfoPtr pScrn, DisplayModePtr modeList,
 }
 
 Bool
-xf86ModeIsReduced(DisplayModePtr mode)
+xf86ModeIsReduced(const DisplayModeRec *mode)
 {
     if ((((mode->HDisplay * 5 / 4) & ~0x07) > mode->HTotal) &&
         ((mode->HTotal - mode->HDisplay) == 160) &&
@@ -698,7 +698,7 @@ xf86GetDefaultModes (Bool interlaceAllowed, Bool doubleScanAllowed)
 
     for (i = 0; i < xf86NumDefaultModes; i++)
     {
-	DisplayModePtr	defMode = &xf86DefaultModes[i];
+	const DisplayModeRec	*defMode = &xf86DefaultModes[i];
 	
 	if (!interlaceAllowed && (defMode->Flags & V_INTERLACE))
 	    continue;
diff --git a/hw/xfree86/modes/xf86Modes.h b/hw/xfree86/modes/xf86Modes.h
index af5987b24..2fb6a374d 100644
--- a/hw/xfree86/modes/xf86Modes.h
+++ b/hw/xfree86/modes/xf86Modes.h
@@ -40,22 +40,23 @@
 #include "xf86Rename.h"
 #endif
 
-double xf86ModeHSync(DisplayModePtr mode);
-double xf86ModeVRefresh(DisplayModePtr mode);
+double xf86ModeHSync(const DisplayModeRec *mode);
+double xf86ModeVRefresh(const DisplayModeRec *mode);
 unsigned int xf86ModeBandwidth(DisplayModePtr mode, int depth);
 
 int
-xf86ModeWidth (DisplayModePtr mode, Rotation rotation);
+xf86ModeWidth (const DisplayModeRec *mode, Rotation rotation);
     
 int
-xf86ModeHeight (DisplayModePtr mode, Rotation rotation);
+xf86ModeHeight (const DisplayModeRec *mode, Rotation rotation);
 
-DisplayModePtr xf86DuplicateMode(DisplayModePtr pMode);
+DisplayModePtr xf86DuplicateMode(const DisplayModeRec *pMode);
 DisplayModePtr xf86DuplicateModes(ScrnInfoPtr pScrn,
 				       DisplayModePtr modeList);
 void xf86SetModeDefaultName(DisplayModePtr mode);
 void xf86SetModeCrtc(DisplayModePtr p, int adjustFlags);
-Bool xf86ModesEqual(DisplayModePtr pMode1, DisplayModePtr pMode2);
+Bool xf86ModesEqual(const DisplayModeRec *pMode1,
+		    const DisplayModeRec *pMode2);
 void xf86PrintModeline(int scrnIndex,DisplayModePtr mode);
 DisplayModePtr xf86ModesAdd(DisplayModePtr modes, DisplayModePtr new);
 
@@ -65,7 +66,7 @@ DisplayModePtr xf86CVTMode(int HDisplay, int VDisplay, float VRefresh,
 DisplayModePtr xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins);
 
 Bool
-xf86ModeIsReduced(DisplayModePtr mode);
+xf86ModeIsReduced(const DisplayModeRec *mode);
 
 void
 xf86ValidateModesFlags(ScrnInfoPtr pScrn, DisplayModePtr modeList,