* rules/rules.d/78-graphics-card.rules:
  - Tag the DRM device as the primary device for the display for KMS
    supporting drivers, otherwise tag the framebuffer device.   This
    will get exported to Upstart, thus permitting rules such as:

      start on (graphics-device-added PRIMARY_DEVICE_FOR_DISPLAY=1
                or drm-device-added PRIMARY_DEVICE_FOR_DISPLAY=1)

    to select either /dev/fb0 or /dev/dri/card0 as appropriate.