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Lenovo ThinkPad T420 with UEFI Only

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I had tried copying over High Sierra IO80211Family.kext, but that didn't work, even after several reboots, so thought I would give an external USB wifi dongle a try whilst trying to work out how to get the internal card working.

 

The USB dongle didn't work so I went searching for drivers for that and discovered https://github.com/chris1111/WIFI-Network-macOS-High-Sierra, which I installed. On reboot I had wifi, so assumed it was the dongle, but surprisingly it is actually the built in wifi card. Not sure if it's c combination of both the kext and driver, or whether just the driver.

 

Next problem is that sleep does not work from either the menu nor shutting the lid.

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The first post tells you 

Quote

...add the AirPortAtheros40.kext to IO80211Family.kext/Contents/Plugins...

 

So copy the AirPortAtheros40.kext from the HighSierra IO80211Family.kext to the Mojave IO80211Family.kext/Contents/Plugins and run the Kext Utility to repair permissions and update the caches.

 

Will work at the moment, nobody knows if this will work with the official release of Mojave.

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On 9/15/2018 at 10:12 AM, bedfellow said:

I had tried copying over High Sierra IO80211Family.kext, but that didn't work, even after several reboots, so thought I would give an external USB wifi dongle a try whilst trying to work out how to get the internal card working.

 

The USB dongle didn't work so I went searching for drivers for that and discovered https://github.com/chris1111/WIFI-Network-macOS-High-Sierra, which I installed. On reboot I had wifi, so assumed it was the dongle, but surprisingly it is actually the built in wifi card. Not sure if it's c combination of both the kext and driver, or whether just the driver.

 

Next problem is that sleep does not work from either the menu nor shutting the lid.


Wow. Cool. 
I am downloading the driver you have shared and tried if it works to my USB Dongle.
 

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i am sure this is mentioned before... these are the kexts preserved (copied) from High Sierra to enable Mojave on the T420.  I put them all in /S/L/E. They 

Note: the AirportAtheros40.kext does not need to be under the IO80211Family.kext directory.

 

tluck@Toms-Mac /System/Library/Extensions

$ ls -ld *3000* *SNB* *Ath*

drwxr-xr-x  3 root  wheel  96 Mar  5  2018 AirPortAtheros40.kext

drwxr-xr-x  3 root  wheel  96 Mar  9  2018 AppleIntelHD3000Graphics.kext

drwxr-xr-x  3 root  wheel  96 Mar  9  2018 AppleIntelHD3000GraphicsGA.plugin

drwxr-xr-x  3 root  wheel  96 Mar  9  2018 AppleIntelHD3000GraphicsGLDriver.bundle

drwxr-xr-x  3 root  wheel  96 Mar  9  2018 AppleIntelHD3000GraphicsVADriver.bundle

drwxr-xr-x  3 root  wheel  96 Mar  9  2018 AppleIntelSNBGraphicsFB.kext

drwxr-xr-x  3 root  wheel  96 Mar  9  2018 AppleIntelSNBVA.bundle

 

@bedfellow - i presume the kext/driver bundle from chris1111 is making your USB wifi work - not the built-in Intel WiFi.

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