[ltp] battery life on X60 Kubuntu vs XP

[Uwe Brauer]

>>>>> "Igor" == Igor V Rafienko <igorr+tp@ifi.uio.no> writes:

   > on May 18, 2007, 19:01, Uwe Brauer wrote:
   > [ ... ]

   >> I just bought the extended battery for the X60s, however the Kubuntu
   >> energy monitor tells me I have 4 hours with full battery while in XP
   >> I have 5 hours. I have not checked so far, but could it be that the
   >> energy saving method is much better in XP than in Kubuntu?


   > It's close to impossible to tell what the reason for this may be,
   > since you have not told anything that may help narrowing down the
   > topic:

   > * Are you measuring XP and Kubuntu with roughly the same workload? (e.g.
   >   idle with no powerhungry services running)
I think that is the case, I am just logging in.

   > * Regardless of what XP and Kubuntu are telling you, what is the *exact*
   >   power draw given that same workload? (on linux, tp-smapi is your friend.
   >   Check the stats in /sys/devices/platform/smapi/BAT0/power_now

 tp-smapi: it seems that it is not installed, and I can't find it via
 apt-cache search

   > Now, assuming that it *is* actually the case that the power drain in
   > Kubuntu is 20% higher:

   > * Is the CPU in the lowest possible C-state on battery? (C4, I believe).

I am not sure, in debian I could set the scaling of the processor down.
   > * Are you using the powersave governor when on battery?

Again no idea
   > * Do you have wifi on? If so, are you using power saving features for the
   >   wireless card?

That is off.

   > * Is USB (uhci_hcd primarily) preventing the cpu from reaching
   >   C4?
How do I check

   > * Have you tried powertop (<URL: http://linuxpowertop.org/>> to flesh out
   >   the prospective culprit?

No, I will try to install it, seems also not to be in kubuntu rep.
   > * Which frequency is the cpu running on? Is the second core active? (not
   >   sure that the latter makes a difference, though)

Well first is on 1000 but the second on full 1600 MgH that is with
power and with battery no idea how to change it.

I am sorry that I can't give more information, I wish I could.

Uwe