I have a Vaio VGN-SZ71MN/B. This Vaio has 2 graphic cards, controlable with a 
switch that says stamina / speed.
When I select 'stamina' the Intel G965 is used and I have nicely brightness 
control with xbacklight after using the xrandr trick. When I select 'speed' the 
Nvidia Geforce 8 card is used and I have no brightness control.

I have read lots about the Nvidia brightness control problems with Vaio's and 
wondering now the following. If the brightness control is just controllable via 
a register, why is it any different for the Nvidia? Or in other words, is it 
really just a register?
Like others I have observed occasionally flickering when using the Nvidia card, 
might this be related to the brightness control? has it been deliberately 
disabled due to this flickering problem (it might be worse when controlling the 
brightness leds)??

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No Screen Backlight Control; Sony Vaio with nvidia 8 series graphics
https://bugs.launchpad.net/bugs/95444
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