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
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https://bugs.launchpad.net/bugs/954661
Title:
backlight brightness not adjustable by default on Dell XPS 13
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