I set up the above mentioned driver according to
The configuration is correct, xrandr reports both providers, setting the provider output source works and X goes up as expected using kdm. However, the screen remains blank, though the backlight remains active. There are no errors.
Ubuntu 13.04 completely up to date
Kernels 3.8.0-16 and 3.9.0-rc6
Intel Core i5-2410M
Any clues? TIA!