The brightness adjustment works out of the box with Ubuntu, including the function keys. Also, it does not seem matter to Ubuntu because: Some have suggested that Dell's Content Adaptive Brightness Control is interfering I have disabled that in the firmware settings (though I did not apply the patch Dell supplies to do this it requires Windows). to function but that's a software hack (and I want to continue using the modesetting driver if I can help it). Installing xf86-video-intel will allow xbacklight to find a backlight, but it can't adjust it. These will variously add "acpi_video0" and "dell_backlight" to /sys/class/backlight but these also do not adjust the backlight. Both the Backlight and Intel Graphics articles suggest several kernel parameters to address this problem:
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