Re: 2.6.13-rc3 Battery times at 100/250/1000 Hz = Zero difference

Tony Lindgren
2005-07-25T10:21:15Z

* Voluspa <lista1@telia.com> [050722 11:46]:
> On Fri, 22 Jul 2005 20:02:36 +0200 Pavel Machek wrote:
> > will not help. It seems like your machine is simply not able to do
> > reasonable powersaving.
>
> Digging up this patch from last month regarding C2 on a AMD K7 implies
> that the whole blame can be put on kernel acpi:
>
> http://marc.theaimsgroup.com/?l=linux-kernel&m=111933745131301&w=2

AFAIK Linux ACPI expects BIOS to contain all the necessary stuff to enable
C2 and C3. Otherwise they won't get enabled, and you have to create a custom
module like the amd76x_pm is.

There's been some talk on adding a module to enable C2 and C3 states for
various chipsets, but nobody seems to have enough time to do it...

Tony