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maxify
April 8th, 2011, 08:13 AM
Hello everyone,
I know that this problem is often discussed, but nothing I've found so far does really help.

I'm running Ubuntu 10.10 Maverick on a HP ProBook 6555b. While in win7 the battery can make up to 4 hours, Ubuntu drains it often in less than 2 hours. I installed PowerTOP and here is what I get:



PowerTOP version 1.8 (C) 2007 Intel Corporation

P-states (frequencies)
2.50 Ghz 3.7%
2.31 Ghz 0.2%
1.60 Ghz 0.0%
800 Mhz 96.1%
< Detailed C-state information is only available on Mobile CPUs (laptops) >

Wakeups-from-idle per second : 885.1 interval: 5.0s
Power usage (ACPI estimate): 21.2W (1.9 hours)

Top causes for wakeups:
74.6% (1256.0) chrome : hrtimer_start_range_ns (hrtimer_wakeup)
9.8% (165.2) <interrupt> : extra timer interrupt
8.9% (150.0) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
1.5% ( 25.0) <interrupt> : ehci_hcd:usb1, ehci_hcd:usb2, ehci_hcd:usb3, eth1, mmc0
1.4% ( 23.8) firefox-bin : hrtimer_start_range_ns (hrtimer_wakeup)
1.0% ( 17.0) chrome : ep_poll (process_timeout)
0.6% ( 10.2) nautilus : hrtimer_start_range_ns (hrtimer_wakeup)
0.3% ( 5.4) <interrupt> : ahci
0.3% ( 5.2) ksoftirqd/1 : add_timer (wl_timer)
0.3% ( 5.2) <kernel core> : hrtimer_start (tick_sched_timer)
0.3% ( 5.0) syndaemon : hrtimer_start_range_ns (hrtimer_wakeup)
0.1% ( 2.4) Xorg : queue_delayed_work (delayed_work_timer_fn)
0.1% ( 2.2) gnome-terminal : hrtimer_start_range_ns (hrtimer_wakeup)
0.1% ( 2.0) <kernel core> : clocksource_watchdog (clocksource_watchdog)
0.1% ( 2.0) <kernel core> : add_timer (wl_timer)
0.1% ( 1.0) gvfs-afc-volume : hrtimer_start_range_ns (hrtimer_wakeup)
0.0% ( 0.6) <kernel core> : inc_rt_group (sched_rt_period_timer)
0.0% ( 0.6) udisks-daemon : hrtimer_start_range_ns (hrtimer_wakeup)
0.0% ( 0.6) kslowd000 : schedule_timeout_uninterruptible (process_timeout)
0.0% ( 0.4) <kernel core> : sk_reset_timer (tcp_delack_timer)
0.0% ( 0.4) gnome-settings- : hrtimer_start_range_ns (hrtimer_wakeup)
Segmentation fault
Obviously it blames the Chrome browser, however, it gives no simple advice how to fix it. I've also tried installing tuned (https://fedorahosted.org/tuned/), a Fedora tool that should run a daemon and make some improvements, but after typing &quot;service tuned&quot; in the shell I get &quot;unrecognized service&quot;. I tried running &quot;make install&quot; as well as converting a RPM to DEB. The software manager says it's properly installed, but it doesn't seem so.

So there is the last thing I read about, the Ubuntu's laptop mode, but some sources say that it may harm hard drives if improperly configured.

So, please, is there anything I can do, or I'm just helpless? :)
thanks in advance.