[coreboot] Lenovo X200 running Coreboot drains 3-4W more power than with Vendor BIOS

Daniel Kulesz daniel.ina1 at googlemail.com
Sun May 1 14:28:41 CEST 2016

Hi all,

thank you again for the suggestions!

First thing: VGABIOS. I was able to extract the blob (the hint in the wiki is a bit hidden and the introduction of the section is a bit misleading btw) and re-ran the measurements using the proprietary VGA BIOS:

Idle: 13,4W
Stress: 37,2W

So they values are exactly the same as with native graphics init. 

Second thing: Powertop. I did the suggested powertop --autotune experiments in idle and obtained the following results:

vendor BIOS: 8,8W
Coreboot: 12,2W

So in both cases a decrease of around 1,2W.

But still something else drains these extra 3,5W. Not running in C3/C4 would explain that difference maybe. How can I check that? I am now doing another attempt to include the microcode updates, but I doubt this will make such a big difference.

Cheers, Daniel

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