Hi folks! In the last few weeks i've been playing with my laptop and looking forward to get more battery life. Powertop helped me a lot.
I'm a KDE user (specially kmail and konqueror) and one of the first things i wanted to see is how the kde apps were waking up my processor. My first impression was tremendously disappointing as I had hundreds of wake ups!!! I searched on google but couldn't find anything but a knotify patch to reduce wakeups. Trying some things and playing with configs i noticed that if you set your desktop to use a current application's menubar (macos style) will increace the wakeups enourmously so i decided to stay with "only" a desktop menu bar. Other things that made a lot of wakeups were some applets in the panel so i decided to keep just the necessary: clock, bookmark's menu and systray. Finally, i found a really strange thing: while using baghira style knotify,konqueror,kdesktop... were making lots of wakeups so i changed my style to Domino. Having all these things set, my powertop looks like this: Power usage (ACPI estimate): 11,8W (4,0 hours) Top causes for wakeups: 10,0% ( 0,2) kded : schedule_timeout (process_timeout) 10,0% ( 0,2) X : do_setitimer (it_real_fn) 10,0% ( 0,2) hald-addon-acpi : schedule_timeout (process_timeout) 6,7% ( 0,1) kpowersave : schedule_timeout (process_timeout) 6,7% ( 0,1) <kernel core> : queue_delayed_work_on (delayed_work_timer_fn) 3,3% ( 0,1) kwrapper : do_nanosleep (hrtimer_wakeup) 3,3% ( 0,1) ktoshkeyd : schedule_timeout (process_timeout) 3,3% ( 0,1) X : schedule_timeout (process_timeout) 3,3% ( 0,1) kwin : schedule_timeout (process_timeout) 3,3% ( 0,1) kontact : schedule_timeout (process_timeout) 3,3% ( 0,1) konqueror : schedule_timeout (process_timeout) Not bad, eh? Notice there's no wifi interrupts as i had it disabled at the moment of the capture. Talking about other things, i tryed the AHCI powersaving and port-stopping (2.6.22-rc4) patch from Tejun Heo and set the kernel as said in the linuxpowertop webpage ( specially noticed that usb_suspend option reduced power consuming) and set a toshiba-bluetooth and toshiba-acpi patches. Having all these i get 3h 30' of battery with office usage: 40% brightness, surfing the net at slashdot, osnews... talking with IM, a bit of programming with netbeans and listening to music sometimes (half the time?). I needed to set the power saving of my wireless card with : "iwpriv eth0 set_power 5". I hope all these thing are usefull to someone :) I just wanted to share my experiences!!! Damnshock PS: I'd like to thank Tejun Heo for this patch for port-stopping and the patch he recently made to solve the toshiba u200/u205 problem with suspending to ram. Now I'm really satisfied with my laptop!!!
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