I've written a patch which provides a new kernel boot param "i915.enable_backlight=0".
i915.enable_backlight=0 can be used to disable i915 backlight control and the /sys/class/backlight/intel_backlight interface -- useful for systems where intel_backight conflicts with BIOS backlight control. An Ubuntu Precise PPA kernel with the patch applied is here: https://launchpad.net/~kamalmostafa/+archive/i915-enable-backlight Mario/others, please apply the PPA kernel, then boot with "i915.enable_backlight=0". This should resolve the problem (it does on my XPS13). Please confirm. ** Patch added: "i915-enable-backlight.patch" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/954661/+attachment/3073275/+files/i915-enable-backlight.patch -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/954661 Title: backlight brightness not adjustable by default on Dell XPS 13 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/954661/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp