Quick tip: Disabling power button under FreeBSD

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About this blog: Computers hate me. They really do. Every time I try to do something unusual like add new hardware, something is guaranteed to go wrong. I decided to start writing about my constant problems so that someone else might benefit from my experiences - or at least laugh at them!

Quick tip: Disabling power button under FreeBSD

26 August 2008, 1:50pm

Ever accidentally hit the power button on your FreeBSD machine? Even worse, on a machine that is doing some obscure task so you don't realise it has quietly powered off until sometime later? I have, several times, and I've finally found a fix:

/sbin/sysctl hw.acpi.power_button_state=NONE

This disables suspend/shutdown when the power button is pressed briefly. (You may still be able to force the BIOS to power off by holding down the button, but a quick press will be ignored.)