[ltp] poor battery-life on X60T

[Florian Reitmeir]

Hi,

On Mit, 07 Feb 2007, Sascha Heid wrote:

> Am Sonntag, den 04.02.2007, 15:19 +0100 schrieb Laurent Gilson:
> > Hello,
> > > Now im looking for something i could have missed, but i have frequency
> > > scaling running and working (compile-times vary as expected), and every
> > > intel-speedstep support is in my kernel. Im also running laptop-mode for
> > > the hdd.
> > You will miss linux-PHC (support for core and core 2 is planed but not  
> > released).
> I just tried PHC and was able to run 1GHz at 0.7V instead of 1.006,
> Unfortunately though it makes zero difference (maybe 1 minute).
> I get 4:40h with max Display-Brightness when im just booting to console,
> idling, no wlan, no hdd, no whatever.
> 
> Should PHC make any difference at all if the CPU is idle?
> 
> PS: I believe PHC does indeed change the Voltage because the
> voltage-ramp-down script freezes the box as well as decreasing the
> Voltage too much on the higher clocks (0.7V is the minimum).

On core duo phc doesn't work correctly, and in idle mode there isn't much to save..
because the cpu is in normal state very low voltaged.

There is benefit when higher freqs are used.

-- 
Florian Reitmeir