Modifying X.Org Xserver DDX to allow to run X with ordinary user

permissions when no access to HW registers is required. For API changes
    which mostly involve the modifications to make the RRFunc (introduced
    with 6.8) more flexible please check Bugzilla #2407. NOTE: This patch
    applies changes to OS specific files for other OSes which I cannot
    test.

src/dummy_driver.c

@@ -69,6 +69,9 @@ static Bool	DUMMYSaveScreen(ScreenPtr pScreen, int mode);
 static Bool     dummyModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode);
 static void	dummySave(ScrnInfoPtr pScrn);
 static void	dummyRestore(ScrnInfoPtr pScrn, Bool restoreText);
+static Bool	dummyDriverFunc(ScrnInfoPtr pScrn, xorgDriverFuncOp op,
+				pointer ptr);
+
 
 /* static void     DUMMYDisplayPowerManagementSet(ScrnInfoPtr pScrn, */
 /* 				int PowerManagementMode, int flags); */
@@ -103,7 +106,8 @@ DriverRec DUMMY = {
     DUMMYProbe,
     DUMMYAvailableOptions,
     NULL,
-    0
+    0,
+    dummyDriverFunc
 };
 
 static SymTabRec DUMMYChipsets[] = {
@@ -175,7 +179,7 @@ dummySetup(pointer module, pointer opts, int *errmaj, int *errmin)
 
     if (!setupDone) {
 	setupDone = TRUE;
-        xf86AddDriver(&DUMMY, module, 0);
+        xf86AddDriver(&DUMMY, module, HaveDriverFuncs);
 
 	/*
 	 * Modules that this driver always requires can be loaded here
@@ -817,3 +821,19 @@ DUMMYCreateWindow(WindowPtr pWin)
     }
     return TRUE;
 }
+
+
+static Bool
+dummyDriverFunc(ScrnInfoPtr pScrn, xorgDriverFuncOp op, pointer ptr)
+{
+    CARD32 *flag;
+    
+    switch (op) {
+	case GET_REQUIRED_HW_INTERFACES:
+	    flag = (CARD32*)ptr;
+	    (*flag) = 0;
+	    return TRUE;
+	default:
+	    return FALSE;
+    }
+}