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Subject: Re: proposal: set default lid state to S3, performance/economy Cx
 states to Cmax
From: Adrian Chadd <adrian@freebsd.org>
To: John Baldwin <jhb@freebsd.org>
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Cc: Kevin Oberman <rkoberman@gmail.com>,
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On 5 May 2014 13:57, John Baldwin <jhb@freebsd.org> wrote:

> The user in question found this on 9-stable with the existing defaults as the
> HPET was just plain broken on their system and that was unrelated to Cx states.
> (Rather, Cx states were only involved because worries about them are why the
> system chose to use HPET.  Had Cx states been enabled by default, they would
> have had to disable those as well in addition to forcing LAPIC instead of
> HPET.)

Hm. Sounds uncomfortable. How does Windows run on systems like this?
Do the windows drivers just disable HPET and use LAPIC or worse for
timing, and just ignore anything lower than C1?

I'm going to flip the switch to enable Cmax on defaults/rc.conf on -HEAD today.



-a