Here is the link for a video where Matthew Garrett explains, in truly pessimistic tone, why it was so difficult to get APM, then ACPI, then WMI to work on Linux laptops:
http://linuxconfau.blip.tv/file/4719842/
A lot of what people try to do with hybrid graphics linux is to simply read ACPI tables and figure out what the different calls might do, but this is a process that hasn't been helped by any wisely crafted tools so far.
*By the way, TRP4 is a "transient" receptor protein in Drosophila :-)
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