How do I get brightness working on a Lenovo IdeaPad Yoga?

Solution 1:

FOR 12.10

Okay, I found an answer in this page.

This solved my brightness problems permanently:

sudo gedit /etc/default/grub

You will find this line in the new opened window:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Change it to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Save and close the window and type this in the terminal:

sudo update-grub

and reboot.

FOR 13.04

1. Add the acpi_backlight=vendor to your grub default command line
2. Run the update-grub command
3. blacklist the ideapad_laptop by adding "blacklist ideapad_laptop" to your /etc/modprobe.d/blacklist.conf file.
4. Reboot

Solution 2:

I have another solution:

GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""

and

sudo update-grub

fixed it for me.