Below is what I did and it solved my brightness problem. the original doc can be found here: http://www.techjail.net/solved-brightness-problem-in-ubuntu-12-04-precise-pangolin.html
Open terminal ( Ctrl+Alt+T ) and type: 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 This will update your grub and while rebooting your PC, it will set an extra parameter on the grub menu during boot. This problem might have occur on due to the upgrade on kernel. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/991539 Title: brightness control not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/991539/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
