uum... how is this related to ibm/lenovo thinkpads? Ra 19:04, 18 September 2007 (UTC)
- it is related, as it is a software for linux which helps you to get a longer battery life for your laptop which in this case is a thinkpad ;) --Zhenech 20:07, 18 September 2007 (UTC)
- thanks for clarifying (i do use powertop since its released). anyway imho linking to the homepage is ok, but the article does not contain any useful (thinkpad related) information. -- Ra 22:57, 18 September 2007 (UTC)
One of the biggest causes of wakeups on my X31 is ibm-acpi 75% (159.0) <interrupt> : acpi
http://www.lesswatts.org/projects/powertop/known.php#ibm_acpi says: "The ibm_acpi kernel module seems to create a really high number/frequency of ACPI interrupts, which will shorten your battery life a lot. We've not diagnosed this a lot yet, but at this point it's worth trying to unload this kernel module from your kernel."
after follow some of powertop's advice i get down to 8.5-8.4 watts, if i unload ibm-acpi i get down to 8.3 W, with a total of 43 wakeups per second. (this is with an idle gnome desktop on ubuntu hardy with 2.6.24 kernel). does anyone know anything about how to improve ibm-acpi, with out loosing all its useful features.
also forcing HPET seems to increase powerusage by about 0.5 watt. (my statistic are quite low)
followup: getting rid of tp-fancontrol gets rid of 99% of the acpi wake ups.
Duh, if you have something calling into thinkpad-acpi/ibm-acpi a number of times per second, it is obvious going to cause a lot of wakeups ;-)
tp-fancontrol (which actually NEEDS to at least do one sensor sweep per second, and that's 8 to 12 sensors, and a lot of ACPI interrupts for each one of them), or stupid monitoring applet that doesn't know to not bother the sensors more than once every few seconds will cause wakeups.
--hmh 18:23, 20 June 2008 (CEST)