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On the Dell Inspiron 1520 both the atkbd and acpi-video input devices report an event for pressing the brightness up / down key-combos, resulting in user space seeing double events and increasing / decreasing the brightness 2 steps for each keypress. This hwdb snippet suppresses the atkbd events, making the Inspiron 1520 work like most modern laptops which emit brightness up / down events through acpi-video only. Reported by Pavel Malyshev <p.malishev@gmail.com> https://bugzilla.redhat.com/show_bug.cgi?id=1141525