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

Bill Davidsen
2005-08-10T19:03:18Z

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%.