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Implement crtc page_flip callback for bochsdrm. The qemu stdvga has no vblank signaling, so we have to fake it. We do so by instantly calling drm_send_vblank_event. Tested with kmscon. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>