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Linux - Laptop and Netbook Having a problem installing or configuring Linux on your laptop? Need help running Linux on your netbook? This forum is for you. This forum is for any topics relating to Linux and either traditional laptops or netbooks (such as the Asus EEE PC, Everex CloudBook or MSI Wind).


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Old 11-05-2007, 05:17 PM   #1
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powertop reporting a huge number of acpi interrupts

Hi, I'm running Ubuntu Gutsy on a Zepto Znote 6625wd laptop. I ran powertop to see if I could improve the disappointing battery life and got the following results:

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (16.1%)         2.00 Ghz     0.0%
C1                0.0ms ( 0.0%)         1.60 Ghz     0.0%
C2                0.4ms (83.9%)         1200 Mhz   100.0%

Wakeups-from-idle per second : 2115.3   interval: 10.0s
Power usage (ACPI estimate): 30.5W (1.1 hours)

Top causes for wakeups:
  90.1% (3626.5)       <interrupt> : acpi 
   2.8% (113.7)       firefox-bin : schedule_timeout (process_timeout) 
   2.3% ( 94.4)       <interrupt> : uhci_hcd:usb3, iwl4965, nvidia 
   2.3% ( 90.6)       <interrupt> : extra timer interrupt 
   0.6% ( 22.8)       firefox-bin : futex_wait (hrtimer_wakeup) 
   0.6% ( 22.4)              Xorg : do_setitimer (it_real_fn)
Anyone have any ideas why I'm seeing so many acpi interrupts?
Old 11-13-2007, 08:46 AM   #2
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I have the same problem, though slightly less.
No idea what causes it, either.

Top causes for wakeups:
63.0% (699.9) <interrupt> : acpi
System is Linux gentoo-pc 2.6.22-suspend2-r2 #13 SMP Mon Nov 5 18:19:59 CET 2007 i686 Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz GenuineIntel GNU/Linux, running KDE3.5.
The problem only seems to happen in KDE.

Does anybody know?

<Edit> I went through a KDE startup manually, watching powertop. The problem seems to appear whenever anything related to ACPI is started, i.e. ksysguard or the taskbar applet. Doesn't go away when the respective program is closed though. Very weird.

Last edited by FeepingCreature; 11-13-2007 at 09:03 AM.
Old 11-30-2007, 06:53 PM   #3
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I also experience the same problem on my Znote 6625wd laptop with Ubuntu gutsy. Powertop says:

  83,7% (1690,9)       <interrupt> : acpi
I wonder if the bugs relates to powertop, because of the extreme high number of wakeups (I used powertop 1.9).
Old 12-05-2007, 07:01 AM   #4
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Same type of problem for me :/
Running Kubuntu 7.10

Cn Avg residency P-states (frequencies)
C0 (cpu running) (39.5%) 2.21 Ghz 8.5%
C1 0.0ms ( 0.0%) 2.21 Ghz 0.0%
C2 0.2ms ( 7.1%) 1200 Mhz 0.6%
C3 0.4ms (53.4%) 800 Mhz 90.9%

Wakeups-from-idle per second : 1749.7 interval: 10.0s
Power usage (5 minute ACPI estimate) : 360.4 W (0.0 hours left)

Top causes for wakeups:
50.4% (2039.7) <interrupt> : acpi
25.3% (1023.7) <interrupt> : rtc
Old 02-12-2008, 03:59 PM   #5
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site with relevance

Look at this
Old 01-15-2009, 02:12 AM   #6
Registered: Dec 2005
Location: Gdansk, Poland
Distribution: openSUSE 11.0, Ubuntu 8.04
Posts: 37

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Originally Posted by nidelius View Post
I'm in the process of fixing the same problem with interrupts, could you please review the link because it doesn't work.


acpi, powertop, ubuntu

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