diff --git a/[refs] b/[refs]
index 6af882a3a3a2..128be025bb7b 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 94f54f5336aac6801f2a14dcb12467e41b35456a
+refs/heads/master: c8f28f89566321842afb81d3ddd79d611e3587ce
diff --git a/trunk/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c b/trunk/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
index 5fa13267bd9f..02e369f80449 100644
--- a/trunk/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
+++ b/trunk/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
@@ -544,13 +544,13 @@ nv50_disp_curs_ofuncs = {
 static void
 nv50_disp_base_vblank_enable(struct nouveau_event *event, int head)
 {
-	nv_mask(event->priv, 0x61002c, (1 << head), (1 << head));
+	nv_mask(event->priv, 0x61002c, (4 << head), (4 << head));
 }
 
 static void
 nv50_disp_base_vblank_disable(struct nouveau_event *event, int head)
 {
-	nv_mask(event->priv, 0x61002c, (1 << head), (0 << head));
+	nv_mask(event->priv, 0x61002c, (4 << head), 0);
 }
 
 static int