Powertop shows unrealistic ACPI power usage

Hi, I just checked powertop for the wattage my laptop (Toshiba Satellite A305-6916) uses while on battery. The reading is 2 watts, with an estimated 23 hours of battery remaining. This is off by a factor of ten; I happen to know the power usage is closer to 20 watts, and the XFCE battery meter shows a realistic 2 hours of battery remaining. Anyone else seeing this problem? The last time I remember using powertop was probably a few months ago; it was working fine then.

I've updated my laptop today after a long time (3.0.x -> 3.1.5). There is a noticeable improvement in power usage.
powertop wrote:Power usage (ACPI estimate): 0.6W (96.2 hours) (long term: 4.9W,/12.5h)
My question is where is that 0.6 coming from and what does it mean? The long term numbers seem more real (currently dropped to 3.9W,/15.4h and shortly shot up to 8W and dropping again).
Edit: acpi -b matches longterm
Edit2: laptop is Samsung NF210
Last edited by fsckd (2011-12-23 18:19:30)

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I've been affected too and the proc -> sysfs 'reaffirmation' of sorts was my first thought.
Still my issue lies somewhere in between. Powertop simply displays wrong output, now saying my old laptop lasts around 47 hours @ 1 Watt when fully charged -- either that, or my laptop did found the key to ultimate power consumption efficiency while I was sleeping. Damn Transformer.

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I have a thinkpad t61 and I would like to improve the battery's life. In order to do that I'm using the information provided by the "powertop" tool. Everything is fine but I am not able to make powertop show the power usage.. the error message I get is the following:
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ACPI is loaded, as well as THINKPAD-ACPI
Ooopsie - forget about that post. I gonna check this after I have tried powertop running on battery.
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Message Edited by GMAC-R60 on 08-08-2009 12:38 PM
Thinkpad R61 7733-1GU
Thinkpad X61T 7762-54U
Thinkpad X60T 6363-4GU
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Powertop shows unrealistic ACPI power usage

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