[issue2025] CPU P-States not available to powerd(8)

Max Herrgard herrgard at gmail.com
Thu Mar 17 10:19:48 PDT 2011

Sepherosa Ziehau wrote:
On Thu, Mar 17, 2011 at 1:33 AM, Max Herrgard (via DragonFly issue
tracker)<bugs at crater.dragonflybsd.org>  wrote:
So I guess my box doesn't support it. But why does it then print two available
frequencies (1000 MHz and 1800 MHz)?
The check is conducted according to AMD #32559 page 300.

Well, try this patch:
It may be dangerous, if BIOS does generate wrong P-States.
Okay, no luck, patch didn't change anything.

But with powernow.ko loaded I get speeds:

Cool`n'Quiet speeds: 1800 1000 MHz

# sysctl machdep.powernow
machdep.powernow.frequency.target: 1800
machdep.powernow.frequency.current: 1800
machdep.powernow.frequency.available: 1800 1000

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