[ltp] Re: Poor Battery life of T40 (2379-D5U)

[edonia]

Am Mon, 24 May 2004 20:49:21 +0000 schrieb Binary Xerroz:

> i recently bought a Thiinkpad T40 as my first laptop; and all in all im
> very happy with it. i can do all my developing on it  and i can even play
> ET for the most part; however, one thing i am dissatisfied, is the battery
> life the the T40 compared to windows. at full charge windows will give me
> nearly 5 good hours, however, linux, has a hard time giving me 3! ive done
> everything i can think of; cpu is throttled to 600mhz, hard disk is on
> standby, cdrom on standby, etc etc. the only thing really working is the
> fan (which never seems to want to turn off) and the wifi  card. but even
> in windows i have the wifi card going so i know that cant be eating nearly
> 2 hours of battery. a friend of mine has a T40, a slightly older model and
> he claims nearly 5 hours on linux. so i have no idea why im getting such
> poor results from linux, i recently just sent the unit back  due to
> overheating problem and they replaced teh mobo and said battery needed
> replacing, so i got a brand new one, and i got 30 mins more (to make the
> 3hours max). I just ordered a 9cell battery and an ultrabay battery to
> help but i would really like to be able to get something near the windows
> battery life. any suggestions? Thank you.
> 
> Linux 2.6.6
> SpeedFreq
> hdparm -c0 -d0 -B254 -S4 /dev/hda
> 
> 
> 01011000 01100101 01110010 01110010 01101111 01111010 00001101 00001010
> 01111000 00111000 00110110 00100000 01000001 01110011 01110011 01100101
> 01101101 01100010 01101100 01100101 01110010 00100000 01000011 01101111
> 01100100 01100101 01110010 00001101 00001010 01000001 00100000 01011100
> 00100111 01010000 01110010 01101111 01100110 01100101 01110011 01110011
> 01101001 01101111 01101110 01100001 01101100 01011100 00100111 00000000
> 00000000 00000000
> 
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I get about 5 hours on my T40p.
The poor battery life semms to depend on the hole ACPI supplyment. I guess
some or most of the hardware does not save what could be saved.

example:
if you use the madwifi with the thermal and processor module, the card
will contiuosly reset.
Or if i use the internal modem, the processor goes up to 1600...

So what i would try in youre case:
1. Try to use a fixed DSDT Table from http://acpi.sourceforge.net/
then compare!
2. Try amp and compare the time

No further ideas. I guess it will take a long time to improve acpi so far,
for all the hardware out there...

edonia