Thanks - I found a simple way to activate the brightness buttons/controls in Ubuntu on the TX3XP:
1- Open a Terminal
2- Type: sudo gedit /usr/share/hal/scripts/hal-system-lcd-get-brightness
3- Change /bin/sh for /bin/bash on the first line and save
4- Type: sudo gedit /usr/share/hal/scripts/hal-system-lcd-set-brightness
5- Change /bin/sh for /bin/bash on the first line and save
I found this at:
This was the only thing I couldn't do, I can control the volume from the on screen slider and this means I can do what I want - I am not desperate for the other function buttons (CD eject would be handy). I will check out your help file again in a few weeks to see whether you have removed the 'testing' warning.
Thanks again for the help!