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Macbook Pro Mid 2012. The problem was there before upgrade, but recently upgraded to Mojave ( thought it might fix it )

I suspect a bad WiFi card, but the symptoms are very strange, and does not indicate the "Hardware Not Found" error.

• On Boot, WiFi works great, but will shut off anywhere from 30 minutes to 3 hours.

•The WiFi states that it is OFF, and I cannot turn it on via restarting the wireless service via command line or System preferences. Pressing the "Turn Wi-Fi On" button does nothing. The only way to fix is a power off and power on.

enter image description here

•The same problem has occurred on both recovery OS, a system update, and a fresh install ( booted off a different hard drive with a fresh install of MAC), so I have confirmed not a software issue.

•The WiFi Diagnostics tool has not returned anything useful except something along the lines of "enable WiFi and connect to a WiFi network".

•Resetted SMC / PRAM, still have issue

•The well-known typical "hardware not found" message has rarely shown up, I may have seen this happen once, but it is usually the strange problem with WiFi not being able to turn on, not a hardware error message.

EDIT: During Down times, here is what is shown under the WiFi menu on about this Mac: enter image description here

When the Wi-Fi is working, here is what it shows: enter image description here

The only difference is the Country code is set to "X0" whenever it is not working, but was pointed out that I need to connect to network for country code to be found.

EDIT: Output of

log show --predicate '(processImagePath contains "kernel") && (eventMessage contains "AirPort: Link Down")' --style syslog --last 1d

enter image description here

What are the next steps I can take to diagnose this problem?

Skyler 440
  • 759
  • during the down times, what does it show in About this Mac > WiFi ? also are you on some kind managed Mac, or Parental control ? Did you try to log in as different user ? – Ruskes Nov 23 '18 at 04:05
  • I added a screenshot of what it shows. – Skyler 440 Nov 23 '18 at 04:09
  • thanks, so the hardware is all there but something has tuned it off. – Ruskes Nov 23 '18 at 04:13
  • OK, lets run log show --predicate '(processImagePath contains "kernel") && (eventMessage contains "AirPort: Link Down") --style syslog --last 1d to show why it was down for last 24 hours – Ruskes Nov 23 '18 at 04:15
  • also try to tun it on with sudo ifconfig en1 up ` – Ruskes Nov 23 '18 at 04:17
  • "sudo ifconfig en1 up" does not work. And the log command you gave hangs with > symbol, and if I add a quote, it gives me "bad predicate error" – Skyler 440 Nov 23 '18 at 04:23
  • I just tired it on my High Sierra and it works fine – Ruskes Nov 23 '18 at 04:28
  • log show --predicate '(processImagePath contains "kernel") && (eventMessage contains "AirPort: Link Down")' --style syslog --last 1d – Ruskes Nov 23 '18 at 04:29
  • Ok, worked for me that time. Added the output – Skyler 440 Nov 23 '18 at 04:45
  • OK, so it turns off normally, so "something" is legitimately turning your WiFi off. – Ruskes Nov 23 '18 at 05:31
  • Is the country code stored in the hardware, because when it turns off, the country code in the hardware description changes to the X0. And all of the routers nearby are set to US, so it is not a country mismatch – Skyler 440 Nov 23 '18 at 13:58
  • XO is normal (baseline) until it knows which country is it in (the IP number tells that) – Ruskes Nov 23 '18 at 22:12
  • So could the chip be turning itself off? I don't really see any possibility that the software is shutting it off when it does the same thing on a fresh install of mac – Skyler 440 Nov 24 '18 at 01:04
  • I do not think the chip would do that, but do believe it is some app doing it. You have to restart to restart the timer. Since I do not know what apps you have that might do that, you could look for it. Also I would double check your WiFi settings, the DHCP and click on the Renew DHCP lease. – Ruskes Nov 24 '18 at 01:31
  • If it even does it in recovery OS, I don't know what app would be doing it there. – Skyler 440 Nov 24 '18 at 01:42
  • I found this post too which is a similar issue https://apple.stackexchange.com/questions/169924/questionable-wi-fi-problem-on-mbp-how-to-analyse-it – Skyler 440 Nov 24 '18 at 01:43

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