Ubuntu
nvidia-graphics-drivers-180 package

  1. Bug #95444
  2. Comment #15

Comment 15 for bug 95444

Revision history for this message
Michael Doube (michael-doube) wrote : Re: Brightness keys on Sony Vaio with nvidia doesn't work

I agree - I've sent nVidia problems from bug #173652 to this bug. As I understand it, sony-laptop generates ACPI events for the key-presses but the script that it calls doesn't do anything to affect backlight brightness. I'm not sure who's responsible for setting LED backlight: sony-laptop or nvidia driver? Possibly the backlight is an SNC method http://tjworld.net/snc/ or a CMOS register http://tjworld.net/wiki/Sony/Vaio/FE41Z/HackingBiosNvram (please note, I am clueless here...)

And for those who set their 'brightness' with the nVidia tool, you are only changing LCD values, not LED values, i.e. you are changing the colours of the screen not the intensity of the backlight so there is no power saving (only eye saving!).