I've now experienced a much better performance and no more error messages in dmesg since I've installed the linux-backports-modules-intrepid-generic package after Loïc Minier told in Bug #275692 that there's a newer version of ath5k in the backports-modules pkg.
I've now experienced a much better performance and no more error messages in dmesg since I've installed the linux-backports -modules- intrepid- generic package after Loïc Minier told in Bug #275692 that there's a newer version of ath5k in the backports-modules pkg.
I've still blacklisted ath_pci.