[ltp] HPET timer on thinkpads?

[Igor V. Rafienko]

on Oct 23, 2007, 14:37, Damien Challet wrote:

[ ... ]

>> Apologies for what is probably a very ignorant question,
>> but how do you find the power consumption on an idle or sleeping machine?
>
> first of all, you need to unplug the ac adaptor
>
> then either with powertop or cat /proc/acpi/battery/BAT0/state


... alternative:

cat /sys/devices/platform/smapi/BAT<number>/power_now

... which requires tp-smapi.

When it comes to measuring power drain in suspended state, you measure the 
battery state and time and append both to a file. When the laptop wakes 
up, you do the same and compare the difference. My log looks something 
like this:

lapdance battery-data # tail -n 5 /tmp/battery-data/2007-10-23T03\:13
1193102003
67470
after:
1193125285
67280

The first number is seconds since the epoch. The second is the battery 
capacity in mWh. The formula is left as an exercise for the reader :)





ivr
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