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Date: Tue, 20 Sep 2005 13:40:39 +0200
To: Emanuel Strobl <Emanuel.strobl@gmx.net>
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From: Bruno Ducrot <ducrot@poupinou.org>
Cc: freebsd-current@freebsd.org
Subject: Re: powerd (cpufreq) problems
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On Tue, Sep 20, 2005 at 12:32:24PM +0200, Emanuel Strobl wrote:
> Am Dienstag, 20. September 2005 12:14 CEST schrieb Bruno Ducrot:
> [...]
> > > Hmm, how do I "try without acpi_perf and ichss instead"?
> > > I know these words only from the cpufreq man page which isn't really
> > > useful for me since I'm no C coder.
> >
> > Try to boot with
> > hint.acpi_perf.0.disabled="1"
> 
> Heureka! 
> Now I suddenly have dev.ichss :) :
> dev.ichss.0.%desc: SpeedStep ICH
> dev.ichss.0.%driver: ichss
> dev.ichss.0.%parent: cpu0
> dev.ichss.0.freq_settings: 794/-1 496/-1
> 
> dev.cpu changed also a bit but most importatnt: The error has gone and I 
> see the CPU changing frequency :)
> 
> ev.cpu.0.%desc: ACPI CPU
> dev.cpu.0.%driver: cpu
> dev.cpu.0.%location: handle=\_PR_.CPU0
> dev.cpu.0.%pnpinfo: _HID=none _UID=0
> dev.cpu.0.%parent: acpi0
> dev.cpu.0.freq: 62
> dev.cpu.0.freq_levels: 794/-1 694/-1 595/-1 496/-1 434/-1 372/-1 310/-1 
> 248/-1 186/-1 124/-1 62/-1
> 
> Some questions left: Does cpufreq check for different drivers and attach 
> the next best which seems to fit?

In theory yes.

> Does the acpi_perf/ichss driver also adjust the core voltage according to 
> the frequency?

Yes.  But not all of the frequencies you see will scale voltages,
probably because you have acpi_throttle enabled it seems.

> Thanks a lot, now I need someone to help me with my S3 suspend death ;)

Well, I'm supposed to help you there as well somehow, but I have to
look a little bit deeper into FreeBSD acpi implementation.

Cheers,

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.