Q: 27" imac wifi problems (intermittant)

I have the same WiFi problem too. It become slower then disconnects.

I can see the network and other networks available.

If I turn WiFi OFF and ON again the wifi is fine for a while.

10.7.3. made no difference.

iMac i7 27" 2.8 late 2009

My Macbook Pro alongside has no problem at all and is stable.

This is just based on my experience and might not be the same for everyone but, is this maybe a bluetooth related problem?

Fact: when I restart from sleep via bluetooth devices such as keyboard and mouse it drops the wifi connection. But if I use the power button on the mac all is cool!

Fact: my bluetooth keyboard and mouse are dropping off more and more frequently.

Fact: my connection also drops off every now and then when I leave my mac for say 10 mins or so the connection drops again. I can't attribute that to bluetooth at the moment but I am suspecting it might be based on the above. 

Come on Apple! 

So I had downgraded my wifi driver and the wifi worked perfectly for a week or so. But then I installed the OS update and recently it has been bad again. Would the OS update upgrade the driver again? Anyone know?

My original post when I got it working:

This solution that Paul31 suggested seems to have fixed the problem for me (and it is VERY easy):

Has anyone tried this:

http://rys.pixeltards.com/2011/09/04/osx-lion-wifi.html

how to vid: http://www.youtube.com/watch?v=TtxRfFAh8Pg

basically downgrades your wi-fi driver from 4.x to 3.x  The theory is that the 4.x driver has a bug that causes the issue.

Can't even find what you are talking about...are you on 10.6 or ? I'm oin a quad core i7 Late 2009 iMac, 12 gigs of RAM, OS 10.7.3....

So I went to about this mac - more info - then I have a choice of Overview Displays Storage Memory - ?

So I went into Overview - System Report - Newtork - Airport...

but there's noting I can change in there...

?

Sick of this problem. Why would they make a machine that wakes INSTANTLY from sleep, the fastest computer I have EVER had for that, onlhy to spend 30+ seconds searching for the ONLY WI-FI NETWORK IT HAS EVER CONNECTED TO. Totally dumb. Reminds of the stupid **** Windoze used to do.

Cameron

This goes for me too (imac 21,5" mid 2011).

Using the power button OR an USB mouse to wake up works just fine, using bluetooth devices does not.

I purchased 27 Inch Imac in Dec. Since I took it out of the box I have had the same problems dropping the internet connection.

Sometimes the green wi fi led is on but there is no connection.

I have to turn it on and off and this goes on all day. when I wake it up in network mgr says Cable Unplugged ( It is wireless); Configure ipv4:off  click on wi fi no network  selected. I select my network, and am connected. Few minutes later it drops it. I have a windows Desktop and Laptop and never have this problem. Same router.

I don't know if this have been posted before, but here goes:

http://www.youtube.com/watch?v=TtxRfFAh8Pg&feature=player_embedded

It's a shame that Apple still haven't done anything about this!

Early days yet but so far so good. I read an earlier post about starting by the on/off button after sleep rather than the keyboard or mouse and yes it worked. Wifi connections OK, this is since I completed the software up date of 10.7.3, I hope this is for keeps as I am fed up with an ethernet cable all over the place.

I have seen a recent post about starting from sleep by the on/off button instead of the mouse or keyboard and so far it has worked. I can't yet believe but I have tried several times yesterday and again today and bingo the wifi works great eveytime. I have even filed my ethernet cable under pending. I still can't believe It WOW.

The advice on that video worked for me for the most part. I have a late 2011 27" and the video said it would probably only work on late 2009 models. The only issue I have been having since is that I occasionally have to reconnect when waking the computer from sleep, but that problem is infinitely better than dropping the signal every five minutes. I'm glad someone finally came up with a temporary solution until Mac can come up with something better. It's very sad to me that we are more likely to get a fix from some random techie than from any of the highly qualified genius' at mac. Thanks for the $2000 Leapster mac.

http://support.apple.com/kb/DL1501

Just spreading the word...iMac WiFi update....

The iMac WiFi update does the job. What took you so long, Apple?

Yes, I can confirm that my iMac (iMac12,2) after applying the update does in fact reconnect to my preferred network after waking from sleep via bluetooth. I tested sleeping multiple times before the update and then after and it's night and day.

One very important note:

The update will not apply if you have followed the guide to downgrade your IO80211Family.kext. You must first replace the downgraded driver with the original v4 driver for the update to work. You can do so by pulling the file off your Time Machine backup if you have one and placing it on the "Kext Utility" just like you did to downgrade in the first place. Same procedure works for upgrading it back to normal. Once you upgrade, restart your iMac, reconnect to your network and run Software Update. It immediately will find the small update. Update, restart, and voila, you can now use your iMac properly.

Side note: If you are pulling the Lion IO80211Family.kext from your Time Machine, the file is located in your "latest" backup, under "Macintosh HD\System\Library\Extensions"

PS...

I did, in fact, use the downgraded kext and experienced the exact same issue for the duration of using it. For my iMac12,2, it made no difference whatsoever. Just throwing that out there.

Apple just came out with a fix yesterday:  http://support.apple.com/kb/DL1501  I loaded this this morning and my wifi has been good all day.  Yeah!

Mine's fixed as well.

Cheers,

Cameron