5GHz channels no longer available after upgrading to 10.7.3

Interesting. If you can still connect via wired (or 2.4GHz wireless), I would download the 10.7.3 combo update from apple support and reapply it. It appears the driver and family did not fully install with the update.

You can get the update here:

http://support.apple.com/kb/DL1484

If you re-install the combo update and you still do not have 5GHz channels, please open the System Information tool and post all of the text you see on the right for WiFi. E.g.:

Software Versions:

CoreWLAN: 2.1.2 (212.1)

CoreWLANKit: 1.0.2 (102.2)

Menu Extra: 7.0.2 (702.1)

configd plug-in: 7.1.2 (712.1)

System Profiler: 7.0 (700.3)

IO80211 Family: 4.1.2 (412.2)

WiFi Diagnostics: 1.0.1 (101.1)

AirPort Utility: 6.0 (600.92)

Interfaces:

en1:

Card Type: AirPort Extreme (0x168C, 0x9A)

Firmware Version: Atheros 9380: 4.0.61.4-P2P

MAC Address: 10:9a:dd:9e:a9:96

Locale: FCC

Country Code:

Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161, 165

Wake On Wireless: Supported

AirDrop: Supported

Status: Network Service Inactive

Also, it would be interesting to see the contents of the appropriate driver direcotry for wireless. If the fresh install of the combo update does not fix your issue, open a terminal and do:

cd /System/Library/Extensions/IO80211Family.kext/Contents/PlugIns

ls -la

Then post the results in this thread.

Also, in the same terminal do:

sudo kextstat

and post the output to this thread.

Have you tried simply disconnecting from the network then

reconnect? Also, what is your wireless router? Also,

how far from the router are you?

No problem. Keep me posted.

Also, if you load the combo driver and things still fail, please post the output here of your kernel log so I can take a look at when the driver is suppose to load.

Really helpful ... thanks.

I have a Time Capsule, Airport Extreme and an 21.5 iMac mid-2011 which I bought in Australia before moving to Germany.

It has driven me crazy trying to work out why my iMac cannot see my 5ghz wireless network (from TimeCapule and extended by my Airport Extreme). The mac Mini and 2 iPads (first and second generation) could both see the 5ghz network ok.

After weeks of looking at this I finally got to this thread and I followed the advice on checking the channels set in the Airport config and those available for WiFi (using "about this mac" from the Apple menu).

The Airport will let me chose a country in AsiaPac and was set to Australia (I could also pick from 7 countries including Vietnam, Hong Kong, NZ etc) ... I could not set any other countries outside that region. When I chose "about this mac" on the Apple menu I see the WiFi settings are:

Locale: APAC

Country Code: DE

Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140

I found that channel 48 was common to AU and DE (listed above) so I set the Airport channel to 48 and now my iMac can see the 5ghz network finally.

Still windering how to get them all in sync as I cant see how to alter either config (previously the I had the 5ghz channel set to 152) ??

But at least it is working ...

Happened to me also on my mid 2011 imac running 10.7.4. What I did was set the "Country" on my time capsule to "Singapore" and leave both 2.4GHz and 5GHz channels to automatic. After restart, all the Support Channels shown up and I'm able to connect to the time capsule on its 5GHz network.

Based on some posts elsewhere, it seems like OS X set its Airport country parameter and Supported Channels based on the country that the OS sees in the airport express/time capsule during start up. Not the time zone in the Preference.

So what I did was setting the "Country" on my time capsule to "Singapore" and leave both 2.4GHz and 5GHz channels on automatic. After restart, all the Support Channels shown up and I'm able to connect to the time capsule on its 5GHz network.

Locale: RoW

Country Code: SG

Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 149, 153, 157, 161, 165