Re: Power consumption HZ100, HZ250, HZ1000: new numbers

[Bill Davidsen]

Pavel Machek wrote:
> Hi!
>
>
> > I was finally able to get C3 state working. It seems that my BIOS is
> > leaving USB controllers in an active state(?). Without any USB drivers
> > loaded, C3 is not possible. With drivers loaded, but no device plugged
> > in C3 works fine. Kernel is 2.6.13-rc3-mm3 + acpi-sbs.
> >
> > With working C3 there are indeed differences:
> >
> > Voltage is 16.5 V
> >
> > HZ=100:  ~460 mA => 7.59 W
> > HZ=250:  ~468 mA => 7.72 W
> > HZ=1000: ~494 mA => 8.15 W
>
>
> 0.55W difference, wow. And that's 7% difference to overall system
> consumption.

But it's totally meaning less isn't it? Disable the USB, there goes the 
kb/mouse, turn off the LCD you can't see anything, spin down the disk, 
you can't do i/o, and run the CPU in idle so you can't DO anything.

At that point you might as well turn it off and save 100%.
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