Re: Centrino question

Cyril Wattebled
2004-05-10T00:28:14Z

Thanks for the link, I applied the patch but I still only have C2 max ...
Any other clues ?

On Sun, 09 May 2004 13:51:13 -0400
Dino Klein <zagzag-lists-zY4eFNvK5D9If6P1QZMOBw@public.gmane.org> wrote:

> I have an Acer C302, with a Pentium M 1.6, and the Intel 855GME chipset.
> The CPU/chipset supports C1 - C4.
> My hypothesis as to why you don't have C3 is because it is disabled thru
> the value of the C3 latency in the FADT. The DSDT code probably has a
> _CST field/method for the processor, which specifies the available
> C-States. I've used a patch (from here
> http://bugzilla.kernel.org/show_bug.cgi?id=1958), that reads the _CST
> object.
> Give it a try, and see if it solves your issue.
>
>
> Cyril Wattebled wrote:
> > Hi there,
> >
> > I'm wondering if all Pentium M processor support C1 C2 and C3 ?
> > Because I have a Sony Vaio Z1 with a Pentium M 1.7ghz and linux only
> > detects C1 and C2. I have a friend who has a Toshiba Tecra with a Pentium M
> > 1.4ghz and it supports C3.
> > I have heard that even C3 and C4 are supported by Centrinos.
> > I'm using kernel 2.6.6-rc3.
> > Is there a logical answer why the kernel does only detect C1 and C3 ?
> > Thanks
> >
> > Cyril
>
>
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