Robert Hooker has provided an additional patch which automatically switches off the i915.enable_backlight parameter (see comment #18) for the Dell XPS13.
The PPA kernel now includes both patches (as of the ~kamal1 version): https://launchpad.net/~kamalmostafa/+archive/i915-enable-backlight
With the PPA kernel installed, backlight control should work properly on the Dell XPS13 without needing any special boot parameters.
Robert Hooker has provided an additional patch which automatically switches off the i915.enable_ backlight parameter (see comment #18) for the Dell XPS13.
The PPA kernel now includes both patches (as of the ~kamal1 version): https:/ /launchpad. net/~kamalmosta fa/+archive/ i915-enable- backlight
With the PPA kernel installed, backlight control should work properly on the Dell XPS13 without needing any special boot parameters.