Comment 2 for bug 290264

It seems that "Support for Atheros 802.11 wireless LAN cards." uses ath_pci, which depends on ath_hal, which is non free:

Output of "jockey-gtk --list":
kmod:ath5k - Support for 5xxx series of Atheros 802.11 wireless LAN cards. (Libero, Abilitato, In uso)
kmod:ath_pci - Support for Atheros 802.11 wireless LAN cards. (Libero, Disabilitato, Non in uso)
xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietario, Disabilitato, Non in uso)

(Translations:
Libero -> Free
Proprietario -> Proprietary
Abilitato -> Enabled
Disabilitato -> Disabled
In uso -> In use
Non in uso -> Not in use
)

Note that actually I have installed the linux-backports-modules-intrepid package and I have enabled the free ath5k module from there.