I can verify this problem on Macbook1,1:

02:00.0 Ethernet controller: Atheros Communications Inc. AR242x
802.11abg Wireless PCI Express Adapter (rev 01)

I've encountered this problem before on other Linux OS'es and is caused
by the ath5k driver Ubuntu uses by default.   Last time I checked, ath5k
did even claim to support my Macbook's AR242x chipset. I'm assuming
AR242x is close enough to the supported chipsets to _almost_ work, but
it still does not work properly.

The alternate driver (madwifi) works like a charm, but it's "restricted"
because it uses a binary hardware abstraction layer (HAL). If you're
compiling your own kernel, make sure to use madwifi from SVN trunk
(rather than 0.9.4 release) with latest (2.6.28+) kernels. Otherwise
madwifi build will fail.

-- 
Jaunty REGRESSION: No WLAN / WiFi with a MacBook Pro rev. 3 - worked ok with 
Intrepid
https://bugs.launchpad.net/bugs/342802
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