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Dell Vostro 3700 backlight problem in Ubuntu Linux 12.04

I've Dell Vostro 3700 / i7 / nvida 330M /  64 Bit Ubuntu 12.04 LTS

After install i've problem with backlight. Backlight keys won't work. I've found that Vostro 3700 is supported by Ubuntu, unfortunatelly nvidia version is not.

I've try fix it this way:

- system update
- get or set last beta proprietery drivers delivered by ubuntu for nvida (NVIDA accelerated graphics driver - experimental 310 in mine case)
- save xorg.conf file from drivers application - NVIDIA XServer Setting (X Server Display Configuration / Save to X Configuration File)
- add "RegistryDwords" "EnableBrightnessControl=1" to xorg device section
- put GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_osi=Linux" into /etc/default/grub and update-grub.
- reboot.

It's now working for me.

When I was trying other paths and other sequences - i've fail.



$uname -a
Linux Vostro-3700 3.2.0-37-generic #58-Ubuntu SMP Thu Jan 24 15:28:10 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux




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