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Fan Service
fan service ASUS laptops generally have a feature that lets the user toggle the fan speed. Fn-F5 on some models, Fn-F on others.
Of course, vendors want to include functionality that isn’t defined in the standard, so they add some extra methods, and then you end up writing some custom drivers anyway, for the little buttons that turn the microphone on and off, etc. (Technically, the ACPI nodes are identified by seven letter names, and the methods live under them, so it’s not really a problem, but somebody got paid to make a solution anyway.) There’s a magic incantation to call an ACPI method and pass it a device id, which could be the keyboard backlight, or the wifi led, or the fan profile, etc.
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