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

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Date:	Fri, 5 Jun 2009 09:19:02 +0200
From:	Harald Welte <HaraldWelte@...tech.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Michael S. Zick" <lkml@...ethan.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 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.

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

-- 
- Harald Welte <HaraldWelte@...tech.com>	    http://linux.via.com.tw/
============================================================================
VIA Free and Open Source Software Liaison
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