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virtio_gpu was failing to send vblank events when using the atomic IOCTL with the DRM_MODE_PAGE_FLIP_EVENT flag set. This patch fixes each and enables atomic pageflips updates. Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>