Possible solution!
This solution may benefit users who have one (or more) of the following symptom(s)/problem(s):
* "no connections available" not able to show or scan SSIDS in windows although radio is ON!
* systems with a n6235 adapter installed won't even boot into any OS Linux/Windows just hangs during early kernel init!
* dropping connections!!!
The solution for the n6235+BT is forcing "ASPM" in the BIOS to "L0s" or even totally disable it if you won't mind! The combined "L1 L0s" and "L1 only" option made this machine just hang/freeze during boot!
The solution for the n7260AC+BT is forcing "ASPM" in the BIOS to "L1" or even totally disable it if you won't mind! The combined "L1 L0s" and "L0s only" option had no bad effect in Linux but made the connections diss appear in Windows 7!
The notebook used for discovering this solution is a Acer Aspire One 522 C60 using Bios 1.12 with a different adapter discussed in this thread "n7260AC+BT" card. Since the n6235 didn't work at all in the first place I was putting my bet on the "intel n7260AC-BT adapter" and ending up having two male functioning cards! ;-(
However the n7260AC-BT did install in windows 7 starter although bluetooth was working fine (after forcing the intel BT drivers otherwise BSODS), the Wifi gave an error "no connections available" even-though the radio was ON and I was not able to see or connect to any SSID'S. Only once in xx reboots I did saw one SSID for a second and than it was gone! Disabling all kind of powersavings in Windows 7 didn't improve the situation!
In linux Ubuntu 12.04.3 amd64 + 3.11 kernel&firmware the n7260AC-BT was working fine, both wifi and bluetooth! :-) Than I read about the Intel Centrino Wireless problems related to n6235 adapters etc and though I was in the same hopeless sinking ship.
Just by luck a modded BIOS was available for this notebook and I gave it a try. This BIOS had very specific options for every PCI-e slot in this notebook. After discovering on which PCI-E slot the wifi-adapter resided by finding a blueprint in the Service Manual, I was able to set the ASPM state for that specific slot only! After disabling it and rebooting to Windows 7 I got a working n7260AC-BT card!!! A week later I decided to try the n6235 that didn't work at all in the first place, guess what it also started working!
After some more little fiddling I discovered that the n7260AC-BT will also work with just L1 as power state, but in contrary the n6235 needs to have L0s to operate!
Maybe this post might help Intel or the OEM notebook manufacturers who might need fix drivers or address BIOS updates to fix the problems for their customers?