I've done a little testing, using both Vista SP2 and Ubuntu 9.10 on my
laptop. I went around to various locations in my house and tested the
signal level my laptop was sensing. I used iwconfig to test the sensed
signal level under Ubuntu and Vistumbler to test the sensed signal level
under Vista. I do not yet know how to test transmit power (in either mW
or dBm) under Vista, so that set of tests will have to wait.

Location 1
Ubuntu: -67 to -75dB
Vista: -44dB

Location 2
Ubuntu: -79 to -87dB
Vista: -59dB

Location 3
Ubuntu: -68dB
Vista: -44dB

For what it's worth, I'm still using WPA2 security. I checked the
transmit signal strength on my WAP, and it's set to high (though it gave
no actual numbers -- just the option of low, medium, and high). So far,
it looks like I'm still having the same bug as the rest of you guys.
I'll post more more stuff as I figure this mystery out.

BTW, do you all have the same symptoms as me? Or am I waaay off here?
i.e. do you all have similar oddities with received signal strength
under ubuntu vs other OSs?

-- 
[Karmic] wireless connection keeps dropping - WPA TKIP
https://bugs.launchpad.net/bugs/481432
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