DRM_IOCTL_WAIT_VBLANK 891 include/uapi/drm/drm.h #define DRM_IOCTL_WAIT_VBLANK DRM_IOWR(0x3a, union drm_wait_vblank) DRM_IOCTL_WAIT_VBLANK 891 tools/include/uapi/drm/drm.h #define DRM_IOCTL_WAIT_VBLANK DRM_IOWR(0x3a, union drm_wait_vblank)