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-rw-r--r--shared-core/i915_dma.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index cb5dcea8..8991a3ce 100644
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -177,6 +177,10 @@ static int i915_initialize(drm_device_t * dev,
*/
dev_priv->allow_batchbuffer = 1;
+ /* Enable vblank on pipe A for older X servers
+ */
+ dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A;
+
/* Program Hardware Status Page */
dev_priv->status_page_dmah = drm_pci_alloc(dev, PAGE_SIZE, PAGE_SIZE,
0xffffffff);