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Ubuntu backlight problem with Nvidia graphics

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http://askubuntu.com – I have a laptop mySN QMG6 / Chiligreen Mobilitas NW which is Quanta TW9 barebone with intel i3 and nvidia 335m GT onboard. On ubuntu distros 10.04, 10.10, 11.04 and 11.10 i had problem with changing screen backlight with nouveau and nvidia drivers. FN+F4/F5 buttons did not change my brightness. I tried to edit xorg.conf, adding Option “RegistryDwords” “EnableBrightnessControl=1″ Also tried to add some lines to grug acpi_osi="Linux" acpi_backlight=vendor Neither worked for me. Today I installed Ubuntu 12.04 beta2 and... With nouveau driver my FN key works, and changes the (HowTos)

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Submitted by Songlist on 04/09/2012 – Made popular on 04/09/2012

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My laptop is a Sony Vaio S13 laptop with a Nvidia 310M graphics card. Ever since I installed Ubuntu on it (11.10, now running 12.04) I have been having a recurring problem with the brightness controls.

I have Ubuntu 12.04 on a notebook HP Elibook 8540w, working with the recommended additional NVidia driver. The graphic card is a QUADRO FX 1800M.

I can't change the screen brightness on my laptop (Asus G53JW) with 12.10 installed. I have tried many ways to solve the problem, but nothing worked. I tried to edit grub with acpi_vendor and acpi_osi (I have tried all the combinations found on the ubuntu.org forum but still I can't change it.