proposal: set default lid state to S3, performance/economy Cx states to Cmax

[Adrian Chadd]

[snip]

The easy-to-run test is "sysctl dev.cpu.0.cx_lowest=Cmax" and then use stuff.

The problem is that we're not getting anywhere near enough exposure to
this kind of stuff because we don't have it on by default and we don't
have an active QA group with ridiculous amounts of hardware.

So, I'd like to flip it on and then start blacklisting devices that
actively don't work in halt states above C1. We're never going to
cross this bridge fully if we leave things at C1 out of fear.

I'm only suggesting we do this on -HEAD. If it's too scary then we can
always flip the default back to C1 for 11.0-RELEASE.



-a