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Dell XPS 13 Ultrabook L321X brightness control

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https://bbs.archlinux.org – I've got a fix working for my XPS 13 (although I'm struggling to get it working at boot with systemd currently).Anyways, through trial and error I've found that I need to set /sys/class/backlight/intel_backlight/brightness to 0 before changes to /sys/class/backlight/acpi_video0/brightness will affect actual screen brightness. You will need to do this regardless of whether the intel_backlight/brightness is already set to zero, the act of setting the value is what allows the acpi_video0 interface to change the brightness. I use this script after login to initialize my ability to m (HowTos)