Disable CRTC when SetSingleMode has no matching mode. Update RandR as…

… well.

xf86SetSingleMode tries to resize all crtcs to match the selected mode. When
a CRTC has no matching mode, it now disables the CRTC (instead of crashing).

Also, poke the RandR extension when xf86SetSingleMode is done so that
appropriate events can be delivered, and so that future RandR queries return
correct information.

hw/xfree86/modes/xf86Crtc.c

@@ -233,8 +233,6 @@ xf86CrtcSetMode (xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation,
     int			saved_x, saved_y;
     Rotation		saved_rotation;
 
-    adjusted_mode = xf86DuplicateMode(mode);
-
     crtc->enabled = xf86CrtcInUse (crtc);
 
     if (!crtc->enabled)
@@ -243,6 +241,8 @@ xf86CrtcSetMode (xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation,
 	return TRUE;
     }
 
+    adjusted_mode = xf86DuplicateMode(mode);
+
     didLock = crtc->funcs->lock (crtc);
 
     saved_mode = crtc->mode;
@@ -1817,6 +1817,11 @@ xf86SetSingleMode (ScrnInfoPtr pScrn, DisplayModePtr desired, Rotation rotation)
 	    else
 		crtc_mode = xf86OutputFindClosestMode (output, desired);
 	}
+	if (!crtc_mode)
+	{
+	    crtc->enabled = FALSE;
+	    continue;
+	}
 	if (!xf86CrtcSetMode (crtc, crtc_mode, rotation, 0, 0))
 	    ok = FALSE;
 	else
@@ -1828,6 +1833,7 @@ xf86SetSingleMode (ScrnInfoPtr pScrn, DisplayModePtr desired, Rotation rotation)
 	}
     }
     xf86DisableUnusedFunctions(pScrn);
+    xf86RandR12TellChanged (pScrn->pScreen);
     return ok;
 }
 

hw/xfree86/modes/xf86RandR12.c

@@ -1048,6 +1048,28 @@ xf86RandR12CreateScreenResources12 (ScreenPtr pScreen)
     return TRUE;
 }
 
+/*
+ * Something happened within the screen configuration due
+ * to DGA, VidMode or hot key. Tell RandR
+ */
+
+void
+xf86RandR12TellChanged (ScreenPtr pScreen)
+{
+    ScrnInfoPtr		pScrn = xf86Screens[pScreen->myNum];
+    xf86CrtcConfigPtr   config = XF86_CRTC_CONFIG_PTR(pScrn);
+    XF86RandRInfoPtr	randrp = XF86RANDRINFO(pScreen);
+    int			c;
+
+    if (!randrp)
+	return;
+    xf86RandR12SetInfo12 (pScreen);
+    for (c = 0; c < config->num_crtc; c++)
+	xf86RandR12CrtcNotify (config->crtc[c]->randr_crtc);
+
+    RRTellChanged (pScreen);
+}
+
 static void
 xf86RandR12PointerMoved (int scrnIndex, int x, int y)
 {

hw/xfree86/modes/xf86RandR12.h

@@ -33,5 +33,6 @@ Bool xf86RandR12SetConfig(ScreenPtr pScreen, Rotation rotation, int rate,
 Rotation xf86RandR12GetRotation(ScreenPtr pScreen);
 void xf86RandR12GetOriginalVirtualSize(ScrnInfoPtr pScrn, int *x, int *y);
 Bool xf86RandR12PreInit (ScrnInfoPtr pScrn);
+void xf86RandR12TellChanged (ScreenPtr pScreen);
 
 #endif /* _XF86_RANDR_H_ */