Cross-post from freedesktop bug, just to make sure it doesn't go unnoticed:
(In reply to Luca Boccassi from comment #13) > Hello, > > I have a Dell Latitude E5540, running an Intel Haswell i7-4600U with GPU HD > Graphics 4400, and I have the same problem. But I noticed that upgrading the > Intel driver to a version that ships a new backlight helper binary fixes the > problem. > > In my case, I am running Debian Jessie. The driver is part of the package > xserver-xorg-video-intel and the version that ships the new backlight > helper, according to the changelog, is: > > xserver-xorg-video-intel (2:2.99.911+git20140529-1~exp1) experimental; > urgency=low > > * New upstream prerelease. (closes: #748753) > * Install new backlight helper. > > Kind regards, > Luca Boccassi
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