linux-kernel - Re: bug? acpi p-state + ondemand keeps dropping max freq

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Message-ID: <20080616074337.46d6f411@infradead.org>
Date:	Mon, 16 Jun 2008 07:43:37 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Pavel Machek <pavel@...e.cz>
Cc:	auke-jan.h.kok@...el.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, len.brown@...el.com,
	cpufreq@...ts.linux.org.uk, davej@...emonkey.org.uk
Subject: Re: bug? acpi p-state + ondemand keeps dropping max freq

On Mon, 16 Jun 2008 12:42:00 +0200
Pavel Machek <pavel@...e.cz> wrote:

> On Sat 2008-06-07 14:54:35, Arjan van de Ven wrote:
> > On Sat, 7 Jun 2008 23:39:18 +0200
> > Pavel Machek <pavel@...e.cz> wrote:
> > 
> > > > # echo 1866000 > scaling_max_freq ; cat scaling_max_freq
> > > > 800000
> > > > # echo 1866000 > scaling_max_freq ; cat scaling_max_freq
> > > > 800000
> > > > 
> > > > 
> > > > This renders my Dothan to utterly poor speeds. (standard T43)
> > > > 
> > > > performance cpufreq governor makes no difference - I still can't
> > > > change the frequency upper/lower values.
> > > 
> > > Hmm, I have similar problem in Novell bugzilla, on very different
> > > hw:
> > > 
> > > https://bugzilla.novell.com/show_bug.cgi?id=396311
> 
> > are either of you running gnome-power-manager or kpowersaved ?
> > sometimes these programs (and more likely, the patches added by a
> > distro maintainer who doesn't fully realize how power works) tend to
> > muck with kernel settings around CPU frequency that they have
> > absolutely no business touching...
> 
> In novel bugzilla case ignore_ppc=1 helped, so it seems to be BIOS
> problem, not userland's...

well as long as the user doesn't use this for production use... the
BIOS often reduces frequencies available to deal with thermal
situations, so it's not a good idea to ignore that.
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