Upstream developer Daniel Vetter has developed a more sophisticated
backlight patch set which fixes this problem for the Dell XPS 13z. I
have updated my DellXPS kernel PPA to include this new patch set since
it will likely appear in the mainline kernel soon (the new "kamal1"
version of the PPA kernel is queued to build, and will become available
within the next day or so):
https://launchpad.net/~kamalmostafa/+archive/dellxps
Note that the new PPA kernel NO LONGER includes the
i915.enable_backlight kernel boot parameter -- it is no longer necessary
for the Dell XPS 13z. Hopefully it is likewise no longer necessary for
other systems which saw improvement with the old kernel...
@Thomas Lärm (rundablage) - Please advise whether the new "kamal1"
version PPA kernel still fixes your brightness control on your Panasonic
CF-18!
Anyone else with a brightness control problem machine other than Dell
XPS 13z - Please advise if the new "kamal1" version PPA kernel makes
brightness control better, or worse (reports of "no change" are not
needed).
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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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