Comment 9 for bug 63989

$ sudo rmmod prism2_pci hostap_pci hostap orinoco_pci orinoco hermes
$ sudo modprobe orinoco_pci

But a better solution is to create a file like in /etc/modprobe.d/blacklist-for-ma311 and put the following lines in it:

# This makes sure only orinoco/_pci gets loaded for my prism2.5 card
blacklist prism2_pci
blacklist hostap_pci
blacklist hostap

This makes sure only the orinoco drivers are loaded and there are no conflicts over the hardware, so everything works at boot.