Another thing I have noticed. The ping times to the router on the HP
Elitebook are consistently 3ms when running quantal. The "working" test
configurations (HP Elitebook/Lucid,HP Elitebook/Windows7,Thinkpad
T61p/Quantal) all show consistently under 1ms. This is when the
connection is working stably, after a time when the connection starts
degrading (tx fifo queu failure messages), ping times start to go up
considerably and become highly erratic. Ping is a limited test tool but
this is curious.

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https://bugs.launchpad.net/bugs/836250

Title:
  8086:4238 [Oneiric] [Regression] Intel Corporation Centrino Ultimate-N
  6300 poor networking, packet loss and very slow Lenovo X201 and T500
  laptops

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