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Thread: kacpi_notify hogging CPU time.

  1. #1
    Join Date
    Dec 2008
    Location
    Canada
    Posts
    65

    Default kacpi_notify hogging CPU time.

    Hey guys,

    Recently I have noticed that the process kacpi_notify is using constantly using 10-14% of my total CPU time, I am running an i7 @ 2.66Ghz. This causes the CPU temp to rise, and eventually the fan will kick in to cool it down, at which point kacpi_notify will stop using CPU time. Then about a minute later it will kick in again and use CPU time up constantly until the fan kicks in because of it. It sounds like something is triggering the process and then it is stuck in an endless loop. I just don't know where I can modify this so it doesn't start up all the time.

    Some tech stuff:

    Kernel: 2.6.34.7
    OS: Opensuse 11.3
    GUI: KDE 4.4.4

    Output for top:
    Code:
     57 root      20   0     0    0    0 R   69  0.0   4260:10 kacpi_notify                                                                                 
       56 root      20   0     0    0    0 S   14  0.0 916:29.00 kacpid                                                                                       
     1706 Hilikus   20   0  425m  29m  15m S    1  0.3   0:04.49 konsole                                                                                      
     2049 root      20   0 2402m 2.2g  11m S    1 25.4 591:52.17 Xorg                                                                                         
    15805 Hilikus   20   0 1440m 224m  54m S    1  2.5  14:13.94 amarok                                                                                       
       27 root      20   0     0    0    0 S    0  0.0   1:33.94 events/0                                                                                     
     1672 Hilikus   20   0  865m  98m  32m S    0  1.1  30:58.50 plasma-desktop                                                                               
     3282 Hilikus   20   0  513m  57m  32m S    0  0.6   0:24.38 kopete                                                                                       
     3453 Hilikus   20   0  737m 190m  39m S    0  2.1 336:29.57 kwin                                                                                         
    27230 Hilikus   20   0  8800 1228  788 R    0  0.0   0:00.01 top                                                                                          
        1 root      20   0 12408  640  612 S    0  0.0   0:04.34 init                                                                                         
        2 root      20   0     0    0    0 S    0  0.0   0:00.03 kthreadd                                                                                     
        3 root      RT   0     0    0    0 S    0  0.0   0:00.12 migration/0                                                                                  
        4 root      20   0     0    0    0 S    0  0.0   1:16.93 ksoftirqd/0                                                                                  
        5 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/0                                                                                   
       35 root      20   0     0    0    0 S    0  0.0   0:00.00 netns                                                                                        
       36 root      20   0     0    0    0 S    0  0.0   0:00.00 async/mgr                                                                                    
       37 root      20   0     0    0    0 S    0  0.0   0:00.00 pm                                                                                           
       38 root      20   0     0    0    0 S    0  0.0   0:00.52 sync_supers                                                                                  
       39 root      20   0     0    0    0 S    0  0.0   0:00.66 bdi-default                                                                                  
       40 root      20   0     0    0    0 S    0  0.0   0:00.00 kintegrityd/0                                                                                
       48 root      20   0     0    0    0 S    0  0.0   0:03.32 kblockd/0                                                                                    
       58 root      20   0     0    0    0 S    0  0.0   0:00.00 kacpi_hotplug                                                                                
       59 root      20   0     0    0    0 S    0  0.0   0:00.12 khubd                                                                                        
       60 root      20   0     0    0    0 S    0  0.0   0:00.00 kseriod                                                                                      
       69 root      20   0     0    0    0 S    0  0.0   2:17.80 kondemand/0                                                                                  
       77 root      20   0     0    0    0 S    0  0.0   0:00.00 khelper                                                                                      
       78 root      20   0     0    0    0 S    0  0.0   0:00.00 khungtaskd                                                                                   
       79 root      20   0     0    0    0 S    0  0.0   0:37.23 kswapd0                                                                                      
       80 root      25   5     0    0    0 S    0  0.0   0:00.00 ksmd                                                                                         
       81 root      20   0     0    0    0 S    0  0.0   0:00.00 aio/0                                                                                        
       89 root      20   0     0    0    0 S    0  0.0   0:00.00 crypto/0                                                                                     
       98 root      20   0     0    0    0 S    0  0.0   0:00.00 kpsmoused                                                                                    
       99 root      20   0     0    0    0 S    0  0.0   0:00.00 usbhid_resumer                                                                               
      127 root      20   0     0    0    0 S    0  0.0   0:00.00 ata/0                                                                                        
      135 root      20   0     0    0    0 S    0  0.0   0:00.00 ata_aux                                                                                      
      136 root      20   0     0    0    0 S    0  0.0   0:00.04 scsi_eh_0                                                                                    
      137 root      20   0     0    0    0 S    0  0.0   0:00.23 scsi_eh_1                                                                                    
      336 root      20   0     0    0    0 S    0  0.0   0:00.01 scsi_eh_2                                                                                    
      338 root      20   0     0    0    0 S    0  0.0   1:03.05 scsi_eh_3                                                                                    
      339 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_4                                                                                    
      341 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_5                                                                                    
      343 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_6

    I didn't have this problem when running opensuse 11.2... only started with 11.3. I'm hoping it will be fixed with 11.4 which is to be released in a month or so. A temp solution would be appreciated.

  2. #2
    Join Date
    Jul 2008
    Location
    Pottstown PA, US
    Posts
    150

    Default Re: kacpi_notify hogging CPU time.

    Hi There
    A quick google of "kacpi_notify" yeilds dozens of hits very much like your problem. Are you having these problems on a laptop or a desktop?
    Two of the of the things I saw suggested making sure your BIOS is up to date and disabling ACPI all together. Obviously, we would like to keep ACPI if we can, so I would check your BIOS first before doing anything else.
    Desktop| opensuse11.3| Core2Q Q9450 | nVidia GeForce 8800 GT
    Server| Arch | mythtv 024 | Core2D E7500| nVidia GT210
    HTPC| opensuse11.3 | mythtv 024| Atom 330 | ASUS AT3IONT-I Deluxe | nVidia ION
    Laptop| System76 | opensuse11.3| Core2D P8600 | nVidia 9300M

  3. #3
    Join Date
    Dec 2008
    Location
    Canada
    Posts
    65

    Default Re: kacpi_notify hogging CPU time.

    Hey pimanac,

    Yeah I did the google search before posting. I notice most are with Ubuntu and are usually dated around 2008. It appears their issues were resolved after a kernel update, but we are long past version 2.6.24.

    I believe the issue starts happening when bringing the machine out of suspend. Suspend works correct, and wakes up no problem... minus this process of course.

    I am running a desktop. It is an Acer M7720.

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