Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

After upgrading from Snow Leopard to Mountain Lion the Wi-Fi on my 2010 MBP basically stopped working. It would stay connected for a few minutes at a time and then drop the connection, connect, drop, etc.

My Wi-Fi access point continued to work with all other devices - it just stopped working on this one machine.

It appears that this issue is also in Lion - there are many threads on discussions.apple.com with users complaining about similar issues:

https://discussions.apple.com/thread/4144707?start=0&tstart=0

https://discussions.apple.com/thread/3191630?start=0&tstart=0

https://discussions.apple.com/thread/3235078?start=0&tstart=0

share|improve this question
add comment

2 Answers 2

up vote 1 down vote accepted

The only solution I found that actually worked was to replace the Mountain Lion Wi-Fi drivers with the ones included in Snow Leopard.

NOTE: This solution is not for the faint of heart and please ensure you've backed up your system - at worst this should only bork your Wi-Fi (which I'm assuming is already broken if you're trying these steps) but it's better to be safe than sorry.

Insert the Snow Leopard DVD into your DVD drive.

Open a Terminal:

sudo -s
cd /System/Library/Extensions
mv IO80211Family.kext /Users/<your acct>/Desktop 
cp -R /Volumes/Mac\ OS\ X\ Install\ DVD/System/Library/Extensions/IO80211Family.kext .

Run Disk Utility and Repair Disk Permission on your system drive

Rebuild the kext cache:

sudo touch /System/Library/Extensions

Wait a few minutes to ensure that the cache has been regenerated and then reboot.

share|improve this answer
add comment

I tried all the tips imaginable. The only solution was to set the channel on the wireless router on channel 11.

It seems to me, the Mountain Lion has a problem when the channel the router is in automatic, then every time the channel is changed, the connection of the wifi card of Macbook disconnects and reconnects.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.