This bug makes daily work a real pain - my wifi is constantly going down
and I have to press the hardware kill switch twice to get it back up
again.

As a work-around, based on the upstream report, I have been running a
script to force the adapter into (slower) g-mode:

sudo rmmod iwlwifi
sudo modprobe iwlwifi 11n_disable=1

This script sometimes causes a complete kernel crash, so I have not made
it run by default, though it has not caused a crash so far when I run it
manually soon after bootup. Perhaps it causes the crash after the
adapter has gone through one of its failure cycles?

After the adapter is in g mode I do still get wifi disconnects but they
are in the order of less than once a day, so I can at least get some
work done.

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https://bugs.launchpad.net/bugs/994104

Title:
  Wireless performance issues on kernel 3.4.0-1-generic (iwlwifi)

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