I'm experiencing the same behavior as above. I'm using Ubuntu 13.10 and
the 3.13 mainline kernel.
I was able to find a workaround that let me control the backlight
brightness through the applet.
Create /etc/X11/xorg.conf.d/20-intel.conf with the following:
Section "Device"
Identifier "HD 4000"
Driver "Intel"
Option "Backlight" "intel_backlight"
EndSection
However, the brightness keys are still broken. I am able to change the
brightness with them, but it will only go down to about 90%. I suspect this has
something to do with the dell_backlight having max_brightness 15 and the
intel_backlight having max_brightness ~4600.
** Changed in: linux (Ubuntu)
Status: Expired => Incomplete
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https://bugs.launchpad.net/bugs/1185927
Title:
8086:0046 [Dell XPS 15 L501x] Unable to change backlight by default
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