linux-kernel - Re: Linux 2.6.30-rc8 [also: VIA Support]

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Message-Id: <200906050227.42295.lkml@morethan.org>
Date:	Fri, 5 Jun 2009 02:27:40 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Harald Welte <HaraldWelte@...tech.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Duane Griffin <duaneg@...da.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.30-rc8 [also: VIA Support]

On Fri June 5 2009, Harald Welte wrote:
> On Thu, Jun 04, 2009 at 10:07:37AM -0700, Linus Torvalds wrote:
> > 
> > 
> > Side note: is it more stable if you disable the VIA speedstep thing 
> > (whatever it's called (ok, google tells me it's called "TwinTurbo" and 
> > "Advanced PowerSaver")?
> > 
> > Features like that easily put a huge stress on power regulators etc, if 
> > they result in sudden changes in current draw.  Underspecced capacitors 
> > etc can cause CPU "brown-outs", which in turn can easily cause total 
> > failure.
> 
> I agree, that might be an interesting test.
> 
> As a side note: The C7-M actually uses the same software interface as Intel CPU
> for doing the power transitions (ACPI Performance States).   Only very early C7
> models used the cpufreq/e_powersaver.c driver.
> 

What is "very early C7 models" in terms of cpuid results?

If you can get permission to reveal those field details -
we can test for that (this build reports "stepping 0" but
I don't trust the report).

Mike
> So if you want to disable it, make sure you disable X86_ACPI_CPUFREQ.
> 


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