MBA can't find preferred network after sleep mode

I finally got my mid 2011 MBA to connect to my preferred network when waking from sleep. It is something you may have read elsewhere but I can confirm it worked for me. You have to disable the "deep sleep mode". When a Air goes into deep sleep is when (for me) it failed to wake my network back up. I switched off deep sleep and not only does it wake up faster it wakes up connected to the Wi-fi network. How do you turn off deep sleep? Using the terminal command

sudo pmset -a hibernatemode 0

If you are like me you may say what is a terminal command? Go to spotlight (that magnifying glass icon top right corner of your screen) and type terminal. Click the Terminal next to Applications. Copy paste the command I posted above and supply your password if you have one. What this does is disables the deep sleep mode that the Air's use for maximum battery life while left sleeping and on battery. This is why my Air always connected to wi-fi when it was plugged in to power, because it never enters deep sleep when on external power. Now the computer goes to sleep and wakes up as intended and no more turning airport on and off to start wi-fi back up. Try for yourself and if it does not work...your Air is broken (I guess).

If it did not work and you want to put the computer back to the way it was go back to terminal as above and then copy and paste this command back in.

sudo pmset -a hibernatemode 3

In case you worried your computer now does not sleep, it does. It goes into plain sleep mode as the old Macbooks that awoke just fine used to do.

I think you are right marc.

I've applied your suggestion, restarted the MBA and went through 3 different networks and it connected at first try. Normally when switching networks it would say "Not able to detect preferred network".

And it makes sense, since when I was in university, after lunch break it would not detect the network. Seems like it was in deep sleep.

I'll try it throughout the week and I'll post the results.

Thanks!

Hi all,

I had the same issue and tried a lot of things. In the end, the only one that worked is to downgrade my Knext (ie. driver).

Here is the how to:

http://www.youtube.com/watch?v=1Iy5lRgVjYM

Enjoy, and let me know if it works

I have OS X 10.8.2 and my wifi was not connecting after waking up from sleep mode.

Deleting the network from the preferredf network list and then connecting again resolved the issue for me.

This fixed my problem: (MBA 2011, 10.8.2) Thanks to lupunus

Then go on and delete the files mentioned below.

You will find the files on your system drive (not your home folder) as follow:

(If you are using Lion, the Library is hidden. You have to use (menu bar) "go to" -> "go to folder" on finder to access them.)

/library/preferences/com.apple.preferences.accounts.plist

/library/preferences/com.apple.preferences.sharing.plist

/library/preferences/SstemConfiguration/preferences.plist

/library/preferences/SstemConfiguration/com.apple.airport.preferences.plist

Message was edited by: Bob Aldridge

I've got exactly the same problem with my 2013 MacBook Air... I've tryed the Airport solution but I cannot find an "Airport tab" on/off or something like that... Any clue? Thank you very much!!