Issue #2968 has been reported by cmusser.

Bug #2968: iwn(4) doesn't associate anymore

* Author: cmusser
* Status: New
* Priority: Normal
* Assignee: 
* Category: Networking
* Target version: 
The iwn wireless interface in recent versions of 4.7 master can no longer 
associate with a base station. ifconfig reports "no carrier" and the 
scan_results command in wpa_cli requently returns "FAIL-BUSY", but not always.

Backing out commit 3aca8a4433acf84c92d5511261b53f2749a67ba8 restores the 
functionality. That commit was a logic change to 'full-offload scanning'.

Here is the dmsesg line specifically describing the hardware in question:

iwn0: <Intel Centrino Advanced-N 6205> mem 0xf0c00000-0xf0c01fff irq 17 at 
device 0.0 on pci3

I have two laptops that exhibit this behavior (they have the same wireless 
interface): a Lenovo x220 and a Lenovo X1 Carbon

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