Now I'm in a fresh new installation of Ubuntu 12.04. The situation has WORSENED. Now (with kernel 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 UTC 2012 i686 i686 i386 GNU/Linux) powertop shows a power usage of 7.50W. Up to this point, the situation is more or less the same with Oneiric (3.0 kernel). The problem is that now with Precise, enebling power save state for the usual "Dispositivo USB: Globetrotter HSDPA Modem", that drains 1.30W (like Oneiric), DOESN'T HAVE ANY EFFECT! So, enabling the power save option from powertop, it changes to "Negative" to "Positive" in the tuneables tab, the Globetrotter modem disappear from the overview tab (i.e. no power consumption from this device are detected any more), but the total system power usage remain the same, at 7.30W. So I have no more the ability to deactivate this device in any way, and the result is a DECREASE OF 1 HOUR of battery life. Moreover, enabling power save for all the devices suggested by powertop, the situation remains the same.
--- There are also a few strange things in powertop overview: if you compare powertop of Oneiric with Precise, you'll see significantly increase of power consumption of: 1. "/usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none" from 21.3 mW to 176 mW. 2. "compiz" from 12.3 mW to 141 mW. 3. "conky" from 7.77 mW to 141 mW (the code is always the same). 4. [46] i915 from 553 µW to 158 mW. 5. hrtimer_wakeup from 587 µW to 80.6 mW. --- SUMMARY: 2.6.35 - 6.5 W (Maveric) 2.6.38 - 8 W 3.0 - 7.2 W (Oneiric, but tunable to 6.6 W) 3.1 - 9 W 3.2 - 7.3 W (Precise, NOT tunable = REGRESSION) Please someone take care of this issues, is very frustrating to have a netbook with 6 cells battery, with only 4h30' of autonomy. With a declared autonomy of about 7 hours ad 6 hours with a power efficient kernel/distribution. Thanks, ask me for any information/test needed. [I'm going to attach powertop overview, devices statistics, tuneables and devices statistics with powersave activate for globetrotter modem, for "Precise Pangoline"] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/875801 Title: Linux power regeression is not improved from Natty to Oneiric to Precise - Netbook Zareason Terra HD To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/875801/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
