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 Kirill Benkovitch,

    Kirill Benkovitch Kirill Benkovitch Jul 9, 2012 2:21 PM in response to JohSm
    Level 1 (5 points)
    Jul 9, 2012 2:21 PM in response to JohSm

    Guys,which MCS index do you have?

    to see it -  hold option key(alt) and click the wifi bar

  • by Glasscut,

    Glasscut Glasscut Jul 9, 2012 2:26 PM in response to Kirill Benkovitch
    Level 1 (15 points)
    Jul 9, 2012 2:26 PM in response to Kirill Benkovitch

    There ya go - http://support.apple.com/kb/TS4209

  • by pavel.pola,

    pavel.pola pavel.pola Jul 9, 2012 10:55 PM in response to Glasscut
    Level 1 (0 points)
    Jul 9, 2012 10:55 PM in response to Glasscut

    Hi Kirill and Glasscut, I have MCS index 0 and I am experiencing this problem even I have the last software installed. That proposed patch was released in february and from time to time (last occurence was last week) I am still having this problem. Somebody have contacted me from Apple Support and suggested local technician discussion but no one called me back. I hope Mountain Lion will be the solution.

  • by Kirill Benkovitch,

    Kirill Benkovitch Kirill Benkovitch Jul 10, 2012 1:00 AM in response to pavel.pola
    Level 1 (5 points)
    Jul 10, 2012 1:00 AM in response to pavel.pola

    Hi!

    MCS index 0 means:

    01BPSK1/26.507.2013.5015.00

    In other words:maximum speed on 20mhz can be 7.20 and maximum speed on 40mhz 15 mb/s.

    It is very very slow.which router do you have?

    Try this things:

    1)wep2+AES

    2)n and g/n mode (try both of them)

    3)change the channel to 1,6 or 11

  • by pavel.pola,

    pavel.pola pavel.pola Jul 10, 2012 2:23 PM in response to Kirill Benkovitch
    Level 1 (0 points)
    Jul 10, 2012 2:23 PM in response to Kirill Benkovitch

    Hi Kirill, today, it happened again. I woke up the iMac from sleep and after a couple minutes, wifi was gone. I am using Apple Airport Extreme in 802.11n mode, channel 100 (DFS, 5 GHz), WPA2 personal, speed 360, MCS index 0, RSSI: -42. It is displayed when pressing Option key and clicking to Wi-Fi icon in the menu bar.

     

     

    But now, after several attempts it says MCS index 0, RSSI -51, speed 450. It seems RSSI and speed is changing, the other remains the same.

     

    Update: while typing this, the wifi drops twice and I need to reboot everytime.

  • by Kirill Benkovitch,

    Kirill Benkovitch Kirill Benkovitch Jul 10, 2012 3:32 PM in response to pavel.pola
    Level 1 (5 points)
    Jul 10, 2012 3:32 PM in response to pavel.pola

    speed 450 and MCS 0..hmmm,sounds more than strange.try to use G only mode.dont use N mode,let's see what will happend

  • by mzero00X,

    mzero00X mzero00X Jul 14, 2012 3:32 PM in response to JohSm
    Level 1 (0 points)
    Jul 14, 2012 3:32 PM in response to JohSm

    I don't know if this applies to anyone else, but I noticed that I have no problems with Wi-Fi connection when I'm alone at home. When my wife comes home, I constantly lose it. Then after testing a few things, I realized that I only lose my connection when she uses her phone (which happens to be an android). She also uses her Macbook air but there seems to be no problems with that. No problems with my iPhone and the iPad either. When she uses her Android phone is when the Wifi issues spring up - on the iMac, macbook, iPhone, and iPad.

     

    This isn't so much of a fix but just something I came across.

  • by singmax,

    singmax singmax Jul 17, 2012 4:15 AM in response to JohSm
    Level 1 (0 points)
    Jul 17, 2012 4:15 AM in response to JohSm

    ha ha ha, I am at the same point. In my case I thought my neighbour is the root cause of the wifi drop. Until today again it was worst case scenario. Wifi dropped continously. But when I am using the Airbook, the airbook wifi works fine. This is really very strange.

    I have tried to switch off all other equipments but still the Mac's wifi connection goes crazy.

    I belive also the problem came with an update one or two month ago.

    I am worry to crash the Mac performance when I would try to revert the installation.

    Sorry not be able to come up with a solution just don't wast your time on tracing after your wifes phone as problem cause.

     

    Also hope to get a solution presented I can manage. Cheers

  • by touchmenot,

    touchmenot touchmenot Jul 22, 2012 10:25 AM in response to JohSm
    Level 1 (0 points)
    Jul 22, 2012 10:25 AM in response to JohSm

    Same issue here with MacBook (Early 2008). Its really annoying to the core. I am having to reboot very often. Sometimes even the reboot does not work. The same issue happened a while back but apple did fix it with an update. Hope this will get the priority.

  • by big-den,

    big-den big-den Jul 22, 2012 1:41 PM in response to touchmenot
    Level 1 (0 points)
    Jul 22, 2012 1:41 PM in response to touchmenot

    I tried everything except deinstalling the patches. I'm praying that a clean installation of Mountain Lion will fix the issue or I'll have to buy a Wifi USB Stick.

  • by Serge Belgium,

    Serge Belgium Serge Belgium Jul 25, 2012 9:16 AM in response to JohSm
    Level 1 (10 points)
    Jul 25, 2012 9:16 AM in response to JohSm

    Anyone installed Mountion Lion? Wifi issues solved?

  • by barrettfromva,

    barrettfromva barrettfromva Jul 25, 2012 7:53 PM in response to Serge Belgium
    Level 1 (0 points)
    Jul 25, 2012 7:53 PM in response to Serge Belgium

    I too have had all the well documented wifi issues on my mac, tried everything 40 times over to no avail. I installed Mountain Lion a few hours ago and am happy to report that the wifi has yet to drop! Hopefully I didn't just jinx myself.........

  • by philkdc,

    philkdc philkdc Jul 25, 2012 7:58 PM in response to barrettfromva
    Level 1 (5 points)
    Jul 25, 2012 7:58 PM in response to barrettfromva

    Good news. . .so far!

  • by Myra J,

    Myra J Myra J Jul 25, 2012 8:24 PM in response to JohSm
    Level 1 (15 points)
    Jul 25, 2012 8:24 PM in response to JohSm

    Same here. Installed Mountain Lion a few hours ago and everything is working great.

  • by big-den,

    big-den big-den Jul 25, 2012 11:31 PM in response to JohSm
    Level 1 (0 points)
    Jul 25, 2012 11:31 PM in response to JohSm

    Since the installation routine (clean install) I can't add a wifi network conenction. In the settings I'm just not offered Wifi. I tried booting the recovery partition but there it still says "no Wfi hardware installed". Ican't remember what Wifi data the system profiler showed in Lion, but now I just see software details, no hardware. Does anybody have an idea how to start the Wifi? It worked before and bluetooth still works so I'm not sure if it's a hardware problem.

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