mwifiex problem: incompatible network settings

[Julien Cubizolles <j.cubizolles@free.fr>]

I can't connect anymore to my home wifi since upgrading my machine from
Ubuntu 15.04 to Ubuntuy 15.10. I was previously running kernel 4.3.0-rc2
from kernel.org without any problem. After the upgrade, and with the
same kernel, I couldn't connect anymore. I built 4.3.0-rc7, and the
problem remains. However, I can connect to the wifi access point from my
Android phone.

Here are the relevant lines from syslog. Let me know if you need more
information.

--8<---------------cut here---------------start------------->8---
Oct 26 16:11:38 touco wpa_supplicant[734]: wlx6045bdf646b4: Trying to associate with f4:ca:e5:ef:be:18 (SSID='southcentral' freq=2462 MHz)
Oct 26 16:11:38 touco wpa_supplicant[734]: wlx6045bdf646b4: CTRL-EVENT-ASSOC-REJECT status_code=1
Oct 26 16:11:38 touco kernel: [   66.745281] usb 1-3: info: trying to associate to 'southcentral' bssid f4:ca:e5:ef:be:18
Oct 26 16:11:38 touco kernel: [   66.745289] usb 1-3: info: mwifiex_is_network_compatible: failed: wpa_ie=0xdd wpa2_ie=0x0 WEP=d	WPA=d WPA2=d EncMode=0xfac02 privacy=0x1
Oct 26 16:11:38 touco kernel: [   66.745291] usb 1-3: Incompatible network settings
Oct 26 16:11:38 touco kernel: [   66.745294] usb 1-3: info: association to bssid f4:ca:e5:ef:be:18 failed
--8<---------------cut here---------------end--------------->8---


The machine is a Microsoft Surface Pro. I've been having a lot of
problems getting the wifi to work but never this particular one, and
they were all fixed in 4.3.0-rc2.

Julien.