Lenovo G580 Brightness

Question

I recently acquired a new laptop, a Lenovo G580 (i5, 4GB) and I am experiencing some issues with the brightness control in ubuntu.

I think that is because of the nvidia vga (which is integrated with the i5, hd4000 graphics). I have tried many "solutions" without success. As I am totally novice with Linux (but not with computers), please, try to be explicit in answers, this would really help.

I have modified the grub with backlight=vendor, making possible to see the brightness control bar, but when y slide it it make no changes at all in the bright who is always at maximum.

I have also tried re-installing ubuntu 12.04 LTS and 13.10.

p.s. I apologize about my english...

Answer 1

Try this:

sudo nano /etc/default/grub

And add/edit to /etc/default/grub in the variable "GRUB_CMDLINE_LINUX_DEFAULT":

acpi_osi=\"!Windows 2012\"

e.g:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""

Then run:

sudo update-grub

For me, works flowless for Lenovo G480.