Christopher, I will try to provide the testing you asked for, but it may
be challenging.

I'm not sure if I can reproduce this bug using a live USB stick since
the problems most often occur after suspend/resume. This laptop is my
primary box for everything, so re-installing the OS is non-trivial. It
may be several weeks before I will have the spare time to do testing on
the development version.

Testing the kernel OTOH is easy. I installed the mainline a few days ago
and so far it is horrible because after resume with the mainline kernel,
xorg is a mess:  mouse works, but the greeter shows up after 20second
pause or my session is already visible from before suspending, but xorg
or at least any applications seem unresponsive.

I am sure I have had the symptoms I reported even from a clean boot
because once rebooting did not solve the problem and I had to reboot a
second time, but it is more rare. The issue is much more common after a
suspend/resume cycle. So far the mainline kernel is connecting using
802.11n after suspend resume (at least once), but since I can't reliably
suspend/resume, its hard to say. I would not trust that 802.11n working
only once or twice after resume means the bug is solved because the
failure was never 100% of the time.

I will report back as soon as I can with anything useful. 
Thanks,
JDR

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https://bugs.launchpad.net/bugs/1281729

Title:
  8086:4238 [Lenovo ThinkPad T430s] iwlwifi using 802.11n associates
  with access point but network is unreachable

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