Enable sound:
- apt-get install alsa-utils (for amixer)
- make sure module 'snd_bcm2835' (snd-bcm2835.ko) is loaded
- amixer cset numid=3 chooses the (default) audio device:
0: auto, 1: analog, 2: HDMI
Play video:
omxplayer -o hdmi
By default, audio comes over the analog connector
(apparently does not use default device).
By the way: the X server is not (yet) accellerated at all. So it
does not use the GPU. Things like OpenGL and GLX are not possible
through X. That's why e.g. omxplayer is a commandline tool.
Use initrd:
In config.txt, add:
initramfs