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Had the same problem.<br>
Asus zenbook UX32VD, Intel HD Graphics 4000
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I'm on debian stable now.<br>
gdm3 is 3.14.1-7<br>
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Take a look <a class="moz-txt-link-freetext" href="https://bugs.freedesktop.org/show_bug.cgi?id=87286">https://bugs.freedesktop.org/show_bug.cgi?id=87286</a><br>
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It provided an idea to try more recent version of the package.<br>
I upgraded "xserver-xorg-video-intel" from stable 2:2.21.15-2+b2 to
testing 2:99.917-2 and it has resolved the issue.<br>
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I used aptitude with, as I recall, 3rd suggestion to resolve
dependencies.<br>
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I had another issue on many other and very recent distros and still
have it:<br>
decreasing (only)
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brightness press key work only once, next presses get an unknown
delay (30-60 seconds) to be finished.<br>
increasing brightness works well when pressing it many times.<br>
True for gnom3 and kde (4, 5).<br>
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