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

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Date:	Thu, 4 Jun 2009 12:27:07 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Duane Griffin <duaneg@...da.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Harald Welte <HaraldWelte@...tech.com>
Subject: Re: Linux 2.6.30-rc8 [also: VIA Support]

On Thu June 4 2009, 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")?
>

The e_powersave code.
Yes, I build test cases with and without - -
It was a fixed-speed kernel build that first hit the 4 hour up-time mark.
I just reposted that build today (the -09143lk).

> 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. 
>

There is also a possible thermal issue with these machines - -
I doubt that VIA runs their qualification testing in bake ovens;
which is what NetBook cases amount too.  ;)

Before the week's end - I am going to run a few of these test builds
with the machine in the freezer - a 20C decrease in ambient should
show if there is any thermal relationship with the problem.

I just need to run my lan into the freezer compartment - one of the
places in this house without a lan connection.  ;)

For want of a documented JTAG port...

Mike
> 
> 		Linus
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