Re: Centrino question

[Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

On Tue, 2004-05-25 at 19:28, Alexander Hoogerhuis wrote:
> On Fri, 2004-05-21 at 10:38 -0700, Ow Mun Heng wrote:
> > On Fri, 2004-05-21 at 04:52, Karol Kozimor wrote:
> > > Thus wrote Cyril Wattebled:
> > > > However, I don't understand, I was told that the centrino processor and chipset
> > > > supports C3 and even C4.
> > 
> > C3 is Supported
> > 
> > 
> > active state:            C2
> > default state:           C1
> > bus master activity:     ffffffff
> > states:
> >     C1:  promotion[C2] demotion[--] latency[000] usage[01028830]
> >    *C2: promotion[C3] demotion[C1] latency[050] usage[04785987]
> >     C3:  promotion[--] demotion[C2] latency[050] usage[00001327]
> > 
> > This is a Dell D600 1.4g. c3 values are low because I have the USB mouse
> > on right now. (note the fffffff??)
> > 
> > I've tested it with and w/o C3. The difference in the battery lifetime
> > was only very minmal. I got like maybe 10 mins extra.

> > I last 2:30 on Linux and 3h on Windows.
> > 
> > Batt Life Sucks..

try dimming the display.

> 
> I've been through tracking down what disables C3 on my laptop (HP
> nc6000). It all happens when the uhci-hci USB drviver goes in. When I
> queried about it on lkml a while back it was due tro some support
> lacking in the UHCI dirvers as of yet.

USB needs to do a better job of recognizing that it is idle.
It isn't really a USB bug, or a missing feature -- more of
a "system integration" issue...

-Len




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