3 files changed, 10 insertions, 8 deletions
diff --git a/src/mesa/drivers/dri/mga/mga_xmesa.c b/src/mesa/drivers/dri/mga/mga_xmesa.c
index 31042f9739b..896f2d94fc6 100644
--- a/src/mesa/drivers/dri/mga/mga_xmesa.c
+++ b/src/mesa/drivers/dri/mga/mga_xmesa.c
@@ -452,7 +452,6 @@ mgaCreateContext( const __GLcontextModes *mesaVis,
    GLcontext *ctx, *shareCtx;
    mgaContextPtr mmesa;
    __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
-   __DRIdrawablePrivate *dPriv = driContextPriv->driDrawablePriv;
    mgaScreenPrivate *mgaScreen = (mgaScreenPrivate *)sPriv->private;
    drm_mga_sarea_t *saPriv = (drm_mga_sarea_t *)(((char*)sPriv->pSAREA)+
 					      mgaScreen->sarea_priv_offset);
@@ -651,9 +650,6 @@ mgaCreateContext( const __GLcontextModes *mesaVis,
 				    debug_control );
 #endif
 
-   dPriv->vblFlags = (mmesa->mgaScreen->irq == 0)
-       ? VBLANK_FLAG_NO_IRQ : driGetDefaultVBlankFlags(&mmesa->optionCache);
-
    (*dri_interface->getUST)( & mmesa->swap_ust );
 
    if (driQueryOptionb(&mmesa->optionCache, "no_rast")) {
@@ -883,7 +879,13 @@ mgaMakeCurrent(__DRIcontextPrivate *driContextPriv,
       mgaContextPtr mmesa = (mgaContextPtr) driContextPriv->driverPrivate;
 
       if (mmesa->driDrawable != driDrawPriv) {
-	 driDrawableInitVBlank( driDrawPriv );
+	 if (driDrawPriv->swap_interval == (unsigned)-1) {
+	    driDrawPriv->vblFlags = (mmesa->mgaScreen->irq == 0)
+	       ? VBLANK_FLAG_NO_IRQ
+	       : driGetDefaultVBlankFlags(&mmesa->optionCache);
+
+	    driDrawableInitVBlank( driDrawPriv );
+	 }
 
 	 mmesa->driDrawable = driDrawPriv;
 	 mmesa->dirty = ~0; 
diff --git a/src/mesa/drivers/dri/mga/mgaioctl.c b/src/mesa/drivers/dri/mga/mgaioctl.c
index 94126a31f91..ff26b9475b9 100644
--- a/src/mesa/drivers/dri/mga/mgaioctl.c
+++ b/src/mesa/drivers/dri/mga/mgaioctl.c
@@ -409,7 +409,7 @@ static void mgaWaitForFrameCompletion( mgaContextPtr mmesa )
 /*
  * Copy the back buffer to the front buffer.
  */
-void mgaCopyBuffer( const __DRIdrawablePrivate *dPriv )
+void mgaCopyBuffer( __DRIdrawablePrivate *dPriv )
 {
    mgaContextPtr mmesa;
    drm_clip_rect_t *pbox;
@@ -428,7 +428,7 @@ void mgaCopyBuffer( const __DRIdrawablePrivate *dPriv )
    FLUSH_BATCH( mmesa );
 
    mgaWaitForFrameCompletion( mmesa );
-   driWaitForVBlank( dPriv, & dPriv->vblSeq, dPriv->vblFlags, & missed_target );
+   driWaitForVBlank( dPriv, & missed_target );
    if ( missed_target ) {
       mmesa->swap_missed_count++;
       (void) (*dri_interface->getUST)( & mmesa->swap_missed_ust );
diff --git a/src/mesa/drivers/dri/mga/mgaioctl.h b/src/mesa/drivers/dri/mga/mgaioctl.h
index f3ae749ca99..0ea0ba1acd4 100644
--- a/src/mesa/drivers/dri/mga/mgaioctl.h
+++ b/src/mesa/drivers/dri/mga/mgaioctl.h
@@ -33,7 +33,7 @@
 #include "mgacontext.h"
 #include "mga_xmesa.h"
 
-void mgaCopyBuffer( const __DRIdrawablePrivate *dPriv );
+void mgaCopyBuffer( __DRIdrawablePrivate *dPriv );
 void mgaWaitForVBlank( mgaContextPtr mmesa );
 
 void mgaGetILoadBufferLocked( mgaContextPtr mmesa );