Re: cpu won't stay in powersave mode

From: Tom Bruno <crweb@vwords.com>
To: Dominik Brodowski <linux@dominikbrodowski.de>
Cc: cpufreq@www.linux.org.uk
Subject: Re: cpu won't stay in powersave mode
Date: Sat, 20 Dec 2003 17:21:13 +0000	[thread overview]
Message-ID: <1071940873.15296.7.camel@localhost> (raw)
In-Reply-To: <20031219161550.GA6909@dominikbrodowski.de>

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On Fri, 2003-12-19 at 16:15, Dominik Brodowski wrote:
> On Mon, Dec 15, 2003 at 03:18:04PM +0000, Tom Bruno wrote:
> > Sorry, accendtly hit reply instead of send to list.
> > 
> > On Mon, 2003-12-15 at 14:14, Thomas Renninger wrote:
> > > Tom Bruno wrote:
> > > 
> > > >Like i said above if I change it via hand using echo, /proc/cpuinfo
> > is
> > > >correct, and the cputest reports the correct speed constantly.
> > > >
> > > >performance mode: 2.4ghz
> > > >powersave mode: 1.2ghz
> > > >Intel P4-M 2.4ghz
> > > >Dell Inspiron 8500 - Bios A05
> > > >kernel-2.6.0-test11
> > > >  
> > > >
> > > /proc/cpu_info didn't work for me, too.
> > > However it seems to work now(after I changed the governors to be 
> > > compiled as modules(or the way around?)).
> > > 
> > I've now tried both as modules, and compiled in, /proc/cpuinfo works
> > niether report correctly.
> > 
> > > If you want to detemine the current real speed of your machine use the
> > > procspeed prog I posted some days ago(04.12, 09.12).
> > 
> > yes, that is the program i spoke of.  However, like i said, when
> > /proc/cpuinfo is reporting wrong, my system works it's way back to full
> > speed even though powersave is in the /sys scaling_governor.
> > 
> > It will report the changed speed (clockdown to 1.2ghz) for about 10
> > seconds, and then will start to report again at 2.4ghz even though the
> > setting haddn't changed.
> 
> I think the BIOS is meddling with the speedstep setting [this is more
> common for older systems, but obviously some vendors still think it's a good
> idea] . If it were cpufreq, the value in /proc/cpuinfo would be updated as
> well.
> 
> Do you run an ACPI-enabled kernel? 
> 
> 	Dominik

  Yes, I have acpi enabled, and to the best of my knowledge, it is
functioning correclty, at least "externally"  /proc/acpi/events works
and returns events and stuff.  Don't know about non visiable internals
though.

New stats:
Dell Inspiron 8500
Bios: A05
Cpu:  Pentium-M 2.4ghz
Gentoo Linux
Kernel: 2.4.23, 2.6.0 

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