Acpi isn't fully compiled into the stock kernel that comes with Slack 12. I fixed it by grabbing the latest kernel (2.6.22) and compiling acpi in - you could also just recompile the existing kernel.
Up to 12, there was a bareacpi.i kernel option, that is no longer there. If you do plan to grab the latest kernel, I find Alien Bob's wiki page very helpful.
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