Daniel, >>> Depending upon how things are set up, this might help. >> Yeah, thanks a lot, works great now! >> I removed patch 3/4 and 4/4 and pushed this one; so currently applied are: >> [PATCH 1/4] drm/i915: clear up backlight inversion confusion on gen4 >> [PATCH 2/4] drm/i915: completely revert the invert brightness quirk >> [PATCH] properly enable the blc controller on the right pipe > Hey, that was just a quick hack to check things ;-) Sorry, too many things in parallel. Spent some time reading the docs you mentioned - will continue to work on the backlight brightness problem and prepare another patch. I just need some more time. Thanks, -Carsten.