brightness not changing on sony vaio cw laptop

[marioac]

Hello,

I am having problems with the brightness control on my sony vaio laptop, at virst when i upgraded the driver for the VGA card the whole screen went blank, I had to port a bin file from windows and write my own EDID file to get it to work (nVidia GT 230M), but I am having problems with the brightness, although ubuntu does read the input from the keys (FN+...), the brightness refuses to change, adding the brightness applet to the taskbar does not work either. I really need to be able to change my brightness because the battery usage is off the charts. I appreciate any help I can get with this. I am using Ubuntu 9.10 - Karmic Koala.

Thank you,
Mario.

[huygens]

There is a dedicated forums for hardware related problems and for laptops: http://ubuntuforums.org/forumdisplay.php?f=332
Perhaps, you should try to search this forum for your Vaio model and see if others had the same problem, or at least to post there your problem. There is a better change for you to get an answer