root@Cubietruck:~# dmesg | grep -i drm
[   17.772071] sun4i-drm display-engine: bound 1e60000.display-backend (ops sun4i_backend_ops [sun4i_backend])
[   17.789512] sun4i-drm display-engine: bound 1e40000.display-backend (ops sun4i_backend_ops [sun4i_backend])
[   17.807201] sun4i-drm display-engine: No panel or bridge found... RGB output disabled
[   17.822624] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops sun4i_tcon_platform_driver_exit [sun4i_tcon])
[   17.841519] sun4i-drm display-engine: No panel or bridge found... RGB output disabled
[   17.856975] sun4i-drm display-engine: bound 1c0d000.lcd-controller (ops sun4i_tcon_platform_driver_exit [sun4i_tcon])
[   18.588765] sun4i-drm display-engine: bound 1c16000.hdmi (ops sun4i_hdmi_driver_exit [sun4i_drm_hdmi])
[   18.605836] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   18.620020] [drm] No driver support for vblank timestamp query.
[   18.620038] fb: switching to sun4i-drm-fb from simple
[   19.321977] [drm] Cannot find any crtc or sizes
[   19.355327] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0
[   21.328266] [drm] Cannot find any crtc or sizes
[  107.547861] sun4i-drm display-engine: fb0:  frame buffer device
root@Cubietruck:~# lsmod | grep sun4i
sun4i_backend          16384  0
sun4i_gpadc_iio        16384  0
sun4i_drm_hdmi         20480  0
sun4i_ss               24576  0
cec                    45056  1 sun4i_drm_hdmi
sun4i_tcon             20480  1 sun4i_drm_hdmi
sun4i_drm              16384  1