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Disabling power management on wireless nic

3289 Views 7 Replies Latest reply: Jul 19, 2012 8:32 AM by godzillafan8686 RSS
thesoundguys Level 1 Level 1 (0 points)
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Dec 14, 2011 7:22 PM

Hi,

 

Is it possible to disable the power management/power save mode for the wireless nic in os x?  In ubuntu, it can be done using iwconfig (ex. iwconfig wlan0 power off )

 

Thanks.

MacBook Pro, Mac OS X (10.7.2)
  • godzillafan8686 Level 1 Level 1 (0 points)
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    Jun 27, 2012 6:47 AM (in response to thesoundguys)

    I'm actually having the same issue and have been looking for a how to on how to do this?

  • kinga1234 Level 1 Level 1 (0 points)
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    Jul 16, 2012 10:42 PM (in response to godzillafan8686)

    Yes, I would like to know how to do this also. We have been asked by Cisco to disable this setting to try to stabilise Lion Clients on wireless

  • Topher Kessler Level 6 Level 6 (9,305 points)
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    Jul 16, 2012 11:33 PM (in response to thesoundguys)

    I don't believe there is such a setting; however, there is a workaround you can implement that should help keep the system connected by having it automatically turn Wi-Fi off and back on to re-establish any lost connections whenever it does not have a proper IP configuration:

     

    http://reviews.cnet.com/8301-13727_7-57347274-263/wi-fi-network-not-connecting-a fter-sleep/

  • godzillafan8686 Level 1 Level 1 (0 points)
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    Jul 18, 2012 5:51 AM (in response to Topher Kessler)

    No, that's not what I've been looking for.

     

    Just like what Kinga1234 said, this is a setting that can cause conflict with some wireless access points that don't support this feature.  And if the laptop is sitting idle for a few minutes, it goes into a low wifi powered state that becomes noticeable with some programs and causes lag.  So I've been trying to find a way to disable it in Mac OS X.   I've gotten it for Windows and Linux / Ubuntu.

     

     

    EDIT:  The connection doesn't get lost, so turning it off/back on won't fix it, it just becomes low powered like I stated above.

  • kinga1234 Level 1 Level 1 (0 points)
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    Jul 18, 2012 8:23 PM (in response to godzillafan8686)

    True, the connection doesnt get lost, but the Cisco Lightweight Access Points recognise the Macbook has dropped into a Low power/Power management state after a few minutes of no network activity. A show client on the console of the WLAN controller shows the client has dropped into a power management state after a few minutes of inactivity, not inactivity on the machine, but network inactivity.

     

    WLANCONTROLLER#>show client detailX.X.X

    Client MAC Address............................... X.X.X.X

    Client Username ................................. XXXXX

    AP MAC Address................................... X:X:X:X:X

    AP Name.......................................... AP_XX

    Client State..................................... Associated

    Client NAC OOB State............................. Access

    Wireless LAN Id.................................. 2

    BSSID............................................ X:X:X:X

    Connected For ................................... 350 secs

    Channel.......................................... 161

    IP Address....................................... X.X.X.X

    Association Id................................... 6

    Authentication Algorithm......................... Open System

    Reason Code...................................... 1

    Status Code...................................... 0

    Client CCX version............................... No CCX support

    Re-Authentication Timeout........................ 82958

    Mirroring........................................ Disabled

    QoS Level........................................ Silver

    802.1P Priority Tag.............................. disabled

    WMM Support...................................... Enabled

    Power Save....................................... ON

    Current Rate..................................... m15

     

    This is enough to force a full re-auth of the client

    Apple clients dont support Cisco CCX extensions so Key Caching cant occur, and full re-auth is required, which can cause client to lose connection.

     

    If the client could be forced to keep the WLAN card active when the macbook is on there would be no issue. Seeing as OSX is based on linux, one would assume this would be a possibility to have this available as an option, even if it doesnt exist currently surely it isnt a limitation of the hardware, merely the OS.

  • Topher Kessler Level 6 Level 6 (9,305 points)
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    Jul 19, 2012 7:35 AM (in response to kinga1234)

    I wonder if setting up an infrequent ping would keep the adaptor from going into a low power mode?

     

         ping -i 10 -q IP_ADDRESS

  • godzillafan8686 Level 1 Level 1 (0 points)
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    Jul 19, 2012 8:32 AM (in response to Topher Kessler)

    The infrequent ping sounds like a great temporary fix, was hoping for a sotware one so it'd be permanent.  Didn't want them having a window open up in the bottom for them to keep that ping going, but that may be the only fix.

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