[Intel-gfx] OT: Power metering [Was: Re: [PATCH] add LVDS downclocking support]

[Erik Andrén]

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Peter Clifton wrote:
> On Mon, 2009-03-23 at 00:30 +0000, Steven J Newbury wrote:
>>> [1]
>>> http://www.alamaison.com.au/p/361923/voltcraft-plus-energy-monitor-3000.html
>> I'm not surprised you didn't see any change measuring power usage at the
>> outlet.  Laptop power supplies are rarely switched mode, and typically
>> provide their full rating while in use.  They aren't typically designed
>> with energy efficiency in mind.
> 
> Actually, this isn't correct. Every laptop PSU is almost certainly a
> Switched mode unit, as is every PC PSU since probably the AT days.

I'm not doubting your expertise in this area but I've successfully
measured other power savings on my laptop using the same setup. It
might not give me the exact measurement but at least a hint on where
things are heading and I can't detect anything that this patch
improves the power efficiency of this laptop.

Best regards,
Erik
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