On Sat, Sep 5, 2009 at 10:59 AM, Sebastien Roy<[email protected]> wrote:
> On Sat, 2009-09-05 at 10:38 +0800, Aubrey Li wrote:
>> > /etc/power.conf shows:
>> >
>> > device-dependency-property removable-media /dev/fb
>> > autopm                  default
>> > autoS3                  default
>> > cpu-threshold           1s
>> > # Auto-Shutdown         Idle(min)       Start/Finish(hh:mm)     Behavior
>> > autoshutdown            30              9:00 9:00               noshutdown
>> > cpupm  enable
>> >
>>
>> 1) change "cpupm enable" to "cpupm enable poll-mode"
>> 2) pfexec pmconfig
>>
>> Does this help to speed down the frequency?
>
> Yes, that did the trick, thanks.

I thought this problem has been improved since

"6818514 Event based CPUPM too easily shifts into high gear"

fixed and putback since build 117 by rev#. 9802. But apparently it's not.

You can reopen this bug or submit a new one.

>  I wonder what changed.

to put this simply, the default mode is event driving, which makes the p-state
transition decision by several sampling points. It's more aggressive.

"poll-mode" makes the transition decision by a tunable sampling period. The
period is 1s on your system (cpu-threshold 1s). It's more stable.

> and if the suspend failures are related.
>  It looks like the system will only suspend if it's at the lowest P-state...
>
I'm not suspend/resume expert, you can post this question on pm-discuss
mailing list.

-Aubrey
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