So it is quite likely that the patch you spotted is responsible for that regression. I have just uploaded a new kernel with that patch reverted to my PPA (https://launchpad.net/~stefan-bader-canonical/+archive/jaunty). It still needs to build, but if that is done, could you try it and confirm (or not) this gives you back your backlight control?
So it is quite likely that the patch you spotted is responsible for that regression. I have just uploaded a new kernel with that patch reverted to my PPA (https:/ /launchpad. net/~stefan- bader-canonical /+archive/ jaunty). It still needs to build, but if that is done, could you try it and confirm (or not) this gives you back your backlight control?