Wifi connection not working with Intel NUC + Wireless AC 7620

I have a NUC as well and found that several minor quirks were fixed when I updated the BIOS to the latest. I urge you to do the same.

Next, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, you may have better connectivity with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. Also, be certain the router is not set to use N speeds only; auto B, G and N is preferred. After making these changes, reboot the router.

Next, I recommend that your regulatory domain be set explicitly. Check yours:

sudo iw reg get

If you get 00, that is a one-size-maybe-fits-all setting. Find yours here: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 Then, set it permanently:

gksudo gedit /etc/default/crda

Use nano or kate or leafpad if you don't have the text editor gedit. Change the last line to read:

REGDOMAIN=IS

Proofread carefully, save and close the text editor. Of course, substitute your country code if not Iceland.

Reboot the NUC and let us know if stability is improved.

Hi again and thanks for the feedback,

So here is what I did:

• BIOS update: done with the release of June 12th 2015. The version previously installed was about one year old.
• Router settings: I had selected WPA (TKIP+AES) because it is stated in my router interface that this is the prefered mode (does not say why though). My other choices are: WEP (but I would disregard this due to low security), WPA (TKIP) or WPA (AES/CCMP). Do you recommend one in particular ?
• Router channel was changed from 13 to 6.
• Exclusive use of N mode of the router: the option does not exist one way or another in the interface. However I am quite sure that the router is not in N only mode because my nettop only support B and G and still is capable of connecting to the wifi.
• Router reboot done.
• The output of iw reg get was indeed 00.
• REGDOMAIN has been changed from 00 to FR.
• The output of iw reg get is now FR.
• NUC reboot done.

I made of few tests yesterday and the wifi response is clearly better. I was able to update through apt-get with a download speed within 500 to 700 ko/s (which is OK I think). Internet browsing was very fast. Today is maybe slightly slower, but hard to tell.

It looks like the issue is solved, but unfortunately, I have been used to these temporary improvements in the past. Let's consider this closed for now and I will post back if the problems show up after a few weeks/reboots/updates.

Thanks again !

i also had this issue with intel nuc skull. driver and bios update didn't help. but switching the channel in my router from "auto" to channel "1" did the job.