I am running it under Lucid right now. The symptoms are a little
different but there are still some issues.

For one, 802.11 does not work, so I had to use 11n_disable=1 to connect
at all (this is a known lucid issue).

It does seem to work better, but I am getting periodic stalls and also seeing 
fairly erratic and high ping times to my access point (varies wildly between 
1-50ms). I don't see the "failure to flush fifo queues" messages but I am 
seeing some of these in dmesg:
iwlagn 0000:44:00.0: iwl_tx_agg_start on ra = 90:f6:52:20:21:6e tid = 0

These messages coincided with perceived stalls in network traffic.


Overall the performance definitely seems more consistent under Lucid but still 
not perfect. This is unfortunately a bit hard to quantify.

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https://bugs.launchpad.net/bugs/1039205

Title:
  8086:4238 iwlwifi lost connections and poor performance with mixed
  networks

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