[ltp] Re: Average Thinkpad T40 battery life

[edonia]

Am Fri, 28 May 2004 07:47:43 -0700 schrieb Crispin Cowan:

> Binary Xerroz wrote:
> 
>> Any! if you have multiple and get different times, list them both
>>
>> but if your asking me, currently i have the standard battery to
>> reiterate:
>> ACPI C3: nearly 5 hours
>> ACPI C2: apx 3 hours
> 
> Uh ... I'm confused. I looked up what C2 and C3 are, and can't figure out
> how or if I might get my machine into those states. What I do know, all
> using ACPI and Linux:

you may look here:
http://acpi.sourceforge.net/documentation/processor.html

When power management is available, the ACPI system can put the CPU into a
sleep state (C2 or C3) when the computer is not using
100% of the CPU's capabilities. This saves power, lowers the temperature
and thus prolonges the life of your CPU.


if you using the 2.6 Kernel, you could switch by the following commands

echo -n "powersave" >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

you can choose between:
perfomance, userspace oder powersave


or just using something like powernowd, it is easy to configure and do all
the job for you:
http://www.deater.net/john/powernowd.html


edonia

> 
>     * big battery:
>           o 5 hours of operation time
>           o burns 6% per hour while in memory suspend
>     * standard battery:
>           o 3 hours of operation
>           o burns 10% per hour while in memory suspend
>     * suspend to disk does not work in linux * "standby" mode appears to
>     do nothing at all * I've never used Windows for 5 hours, so I have no
>     idea :)
> 
> 
>> 01011000 01100101 01110010 01110010 01101111 01111010 00001101 00001010
>> 01111000 00111000
> 
> I second James Knott's comment: this big blob is annoying, and I can't
> figure out what it is for.
> 
> Crispin
> 
> -- 
> Crispin Cowan, Ph.D.  http://immunix.com/~crispin/
> CTO, Immunix          http://immunix.com