Unfortunately, due to various regressions observed on other machines, we've had to revert the backlight control fixes from Ubuntu Quantal (as of 3.5.0-15.23). I will continue to supply these fixes via the Sputnik kernel PPA (for Precise and Quantal), while working on solutions for those problems: https://launchpad.net/~canonical-hwe-team/+archive/sputnik-kernel
Unfortunately, due to various regressions observed on other machines, we've had to revert the backlight control fixes from Ubuntu Quantal (as of 3.5.0-15.23). I will continue to supply these fixes via the Sputnik kernel PPA (for Precise and Quantal), while working on solutions for those problems: https:/ /launchpad. net/~canonical- hwe-team/ +archive/ sputnik- kernel