JohSm
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Q: iMAC 21" WIFI failing after 10.7.4 update

Hi,

 

Before the 10.7.4 update the WIFI connection from the iMac 21.5" to the airport extreme router works fine!

Now it's failing several times a day! it looses the wifi connection and you are unable to see any wireless accesspoints or SSID's

Macbook pro, iphone & ipad + PC's still works fine!

 

The only way to get the wireless up and working again is to shutdown and restart the iMac.

 

Please help, there must be a serious bug in this update any solution available to solve it?

 

In the log i can see alot, don't know if this is some clue or error occuring just after the wireless connection is dropped for unknown reasons.

 

"kernel: 2329.723808: ath_chan_set: unable to reset cannel XX (XX00Mhz) flags 0x10080 hal status 17"

"kernel: 2632.354892: ASSERT: Can not reenter VAP State Machine"

"kernel: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving)."

 

Turning off and on the wireless interface only shows the following in the log, and the wifi will not see any SSID's :

"kernel: 71847.200440: switchVap from 1 to 1"

 

/Johan

iMac, Mac OS X (10.7), 2011 Model i5 - 16GB - AMD 6770M

Posted on May 15, 2012 9:37 AM

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Q: iMAC 21" WIFI failing after 10.7.4 update

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  • by oecs88,

    oecs88 oecs88 Jun 10, 2012 5:11 PM in response to JohSm
    Level 1 (0 points)
    Jun 10, 2012 5:11 PM in response to JohSm

    As mentioned in my previous reply my problem was that the Airport in my MacBook can't "See" any wifi network, not even my iPhone's shared connection.

    I followed the instructions and changed the .kext file but it didn't solve the problem.

    So I decided to make a clean install of Lion 10.7.3 from the file I saved via AppStore and the problem stills the same, hardware seems installed correctly but doesn't find nor connects if i add it manually...

    So I then decided to install Snow Leopard 10.6 from the original DVD bought some years ago, and the problem persists!!!

     

    My MacBook Aluminum 2008 can't find any WiFi SSID

  • by beischel,

    beischel beischel Jun 11, 2012 9:20 AM in response to JohSm
    Level 1 (0 points)
    Jun 11, 2012 9:20 AM in response to JohSm

    Add me to the list of those having this issue. I am not going to mess with the kernel update. I will just wait Apple fixes the freaking mess.

     

    Moved back to using a CAT5 cable for now. Come on Apple, let's get this fixed!

     

    BTW, is there an official bug report that can be researched and referenced?

     

    Duffy

  • by johandutoit2000,

    johandutoit2000 johandutoit2000 Jun 11, 2012 6:38 PM in response to JohSm
    Level 1 (0 points)
    Jun 11, 2012 6:38 PM in response to JohSm

    Deleting all the other possible network connections from the list, solved the problem for me.

  • by MacDaddy_DaddyMac,

    MacDaddy_DaddyMac MacDaddy_DaddyMac Jun 14, 2012 9:55 AM in response to JohSm
    Level 1 (0 points)
    Jun 14, 2012 9:55 AM in response to JohSm

    I've tried all the solutions posted on the internet:

    -Rolling back the wifi driver

    -Adjusting MTU

    -Running background internet activities: ping and Pandora

    -Deleting network settings: preferred network, keychain, etc.

    -Resetting PRAM and NVRAM

    -Router Settings

     

    It has been a frustrating process trying to resolve this issue.

     

    I finally have stable wifi on my 21 inch iMac.

     

    I downloaded Signal from the App store, and played around with the recommended channels.

     

    I tried channel 11; it worked for a little bit, but it eventually started dropping.

    I switched to channel 1, now I am on day two. Wifi has no issues when after waking, and no random drops.

     

    Wireless experts recommend channels 1,6, and 11, so I would start with those settings.

     

    I hope you guys have as much luck as I did with this solution.

  • by schnuseldusel,

    schnuseldusel schnuseldusel Jun 20, 2012 11:05 AM in response to JohSm
    Level 1 (0 points)
    Jun 20, 2012 11:05 AM in response to JohSm

    Anyone got an update on this? Do we have to buy 10.8 to resolve the issue or what...

  • by beischel,

    beischel beischel Jun 20, 2012 11:25 AM in response to schnuseldusel
    Level 1 (0 points)
    Jun 20, 2012 11:25 AM in response to schnuseldusel

    I did read somewhere, not sure if this particular discussion or elsewhere, that someone had success by making the channel used by the wireless fixed instead of automatic.

     

    So I went into the Airport Utility, under Wireless and Wireless option and set the 2.4GHz channel to "1" and so far that "seems" to have resolved the issue. I mean I have not had the wireless on this iMac drop for days.

     

    Of course now that I posted this, it will probably go out within the next hour or so :-)

     

    But for now - maybe - that resolved the issue.

     

    Duffy

  • by oecs88,

    oecs88 oecs88 Jun 20, 2012 4:37 PM in response to schnuseldusel
    Level 1 (0 points)
    Jun 20, 2012 4:37 PM in response to schnuseldusel

    Hopefully a bit earlier, Apple has released OS X 10.7.5 to developers. http://www.macrumors.com/2012/06/19/apple-seeds-os-x-10-7-5-build-11g15-to-devel opers/

  • by philkdc,

    philkdc philkdc Jun 20, 2012 5:16 PM in response to oecs88
    Level 1 (5 points)
    Jun 20, 2012 5:16 PM in response to oecs88

    Hopeful is the key word here -- hopefully this is good news.

  • by radamanthys,

    radamanthys radamanthys Jun 22, 2012 3:01 AM in response to MacDaddy_DaddyMac
    Level 1 (0 points)
    Jun 22, 2012 3:01 AM in response to MacDaddy_DaddyMac

    channel 1, 2.4 GHz has worked so far for me too.........2 days now!!

  • by fishface21,

    fishface21 fishface21 Jun 24, 2012 8:37 AM in response to JohSm
    Level 1 (1 points)
    Jun 24, 2012 8:37 AM in response to JohSm

    So what is the FINAL official fix for reconnecting wifi ?

  • by schnuseldusel,

    schnuseldusel schnuseldusel Jun 24, 2012 8:39 AM in response to fishface21
    Level 1 (0 points)
    Jun 24, 2012 8:39 AM in response to fishface21

    I guess / hope it will be 10.7.5 ...

  • by big-den,

    big-den big-den Jun 25, 2012 6:32 AM in response to schnuseldusel
    Level 1 (0 points)
    Jun 25, 2012 6:32 AM in response to schnuseldusel

    I tried about everything except changing the .kext . Also severals Wifis since I travel a lot. Always the same problems. Sometimes a disconnect, somtimes the message that there is no hardware installed.

     

    The solution that helped me so far is to plug a monitor adapter into the port. I don't even have anything hooked up, just the adapter dangling around. But it's working so far. I tried it in 2 different Wifis so far, with 2 different adapters (VGA, DVI). As soon as I pulled them out, the error occured sooner or later.

     

    A rather obscure solution.

  • by IzzyJG99,

    IzzyJG99 IzzyJG99 Jun 25, 2012 11:35 AM in response to JohSm
    Level 1 (5 points)
    Jun 25, 2012 11:35 AM in response to JohSm

    I just did a clean install of Lion. Traditionally I upgraded to Lion from SL 10.6.8 out of habit. So I did a clean install off the Recovery Partition. Now whenever I start up I have to select my AEX instead of it automatically connecting. Weird. I might try another clean install to see if that fixes the problem.

     

    Haven't had any disconnects or drops that originally drove me away from Lion until 10.7.3. came out and fixed the problem.

     

    Only time it's connected on boot up is after I reset the PRAM. Then if I shut down or restart after that? It continues to fail to connect.

     

    I swear Lion has some serious issues with Wi-Fi....

  • by MacDaddy_DaddyMac,

    MacDaddy_DaddyMac MacDaddy_DaddyMac Jun 25, 2012 2:35 PM in response to JohSm
    Level 1 (0 points)
    Jun 25, 2012 2:35 PM in response to JohSm

    Keep playing around with the channels until you find one that gives you a stable connection. I would start with 1,6, and 11.

  • by aabhasv,

    aabhasv aabhasv Jun 26, 2012 4:46 AM in response to JohSm
    Level 1 (0 points)
    Jun 26, 2012 4:46 AM in response to JohSm

    Hi everyone,

     

    I had same problem a few minutes ago when I updated my MBP late 2010 to 10.7.4 (there is really something about this firmware update - screws wifi). The WiFi didn't complain except that it didn't show list of available networks. iPhone worked fine on BiPAC 7700N wifi router.

     

    Solution that worked for me:

    Connected using ethernet, changed channel from 1 to 2. Turned off WiFi and turned back on. Done.

     

     

    Hopefully, I wouldn't get frequent dropouts.

     

    cheers,

    AV

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