I've been running stock Ubuntu 9.04 on an EEE 701 with an AR242x adapter
and seeing similar problems. iwconfig reports almost constant changes
(changing several times per second) to the bit rate on the wlan0 adapter
when connected to an access point in the same room, with the values
ranging from 1 Mb/s to 36 Mb/s. Link quality and noise level values stay
the same throughout.

Installing the backported drivers in the linux-backports-modules-jaunty
package appears to resolve the issue; the bit rate remains near-constant
at either 48 or 54 Mb/s (with a much slower rate of change), signal
strength is comparable to other wireless-enabled computers I have
available that use the same access point, and download speeds are
consistently good (I can download a 900 MB file over HTTP from a local
server at a constant rate of 3 MB/s) and without apparent episodes of
packet loss.

If it would help, I can revert back to the stock driver and provide
whatever debugging information is required, but based on my experience,
I'd suggest simply trying to get the relevant driver(s) into an update.

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UNR Ath9K unstable connection
https://bugs.launchpad.net/bugs/378156
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