Comment 20 for bug 284354

Quoting Tim here regarding the 'two modules loading' problem:

"The root of the problem is that all Atheros 5K adapters have but a few
unique PCI identifiers. However, 2 adapters with the same PCI ID may
have different RF backends. The newer RF2424 backends are not supported
by the released version of madwifi, yet the madwifi driver still gets
loaded (because the PCI ID matches), fails to init the part, bails out
with an error, and leaves the chipset in an inconsistent state such that
the ath5k adapter cannot init the part either, even though it may have
been able to support the newer backend."

So this can't really be solved without blacklisting one or the other module.