[ltp] T60 battery

[Laurent Gilson]

Hello,

>> Put the other way round: 0.013125 W/MHz vs 0.0125 W/MHz. If the  
>> calulation
>> takes X MHz (and the RAM is lighting fast or everything is in cache) 600
>> MHz is the way to go.
>
> Very interesting! I didn't know the watts used in "low speed" or "high
> speed" (yes, I know that I could calculate).

I got them from the offical specs posted on the intel site. They are  
usually in the "thermal design" part of the white papers.

> a) spindown the hard disk, save to USB pendrive
> b) save every some minutes (yes, my mania with vim :-) ), and unload USB
> modules

The pendrive wins. It may wear out quickly since pendrives can only take  
XY writes before giving up. But the number of cycles is very high for  
quality flashmemory and even with saving every minute it should last years.

> I am also unloading sound card drive and I should with CD-ROM...

Donīt forget Bluetooth, ethernet, ...

>> Next point: watch out for a undervolting tool/hack for your CPU. I saw a
>
> I will check... even when usually I don't like this "low level" features
> :-)

The CPU-frequency scaling already reduces the voltage. It matches a  
voltage to each frequency, lower voltages for lower frequencies. These  
voltages are preset by intel and can be reduced even further, depending  
the CPU, motherboard, powersupply... The hack/patch for the PentiumM  
dothan is foolprof: you can only reduce the voltages, so the worst thing  
that can happen is a hard crash.

cu