I was assigned an Ubuntu desktop with some stuff already on it. I did not reformat it, but atachedattached a mini-PCI wirlesswireless card over ana PCI to mini-PCI adapter. I manually built the madwifimadwifi driver and installed it'sits .ko files.
 Now lshw -C network always shows the card, but it sometimes shows it as 'unclaimed' and sometimes it shows with the madwifimadwifi (i.e. ath_pciath_pci) driver. Any idea what can cause this effect?
 EDIT: Snippet from /var/log/kern.log/var/log/kern.log, on failed load.
Apr 19 11:47:21 manju-desktop kernel: [    9.935304] ath_hal: module license 'Proprietary' taints kernel.
Apr 19 11:47:21 manju-desktop kernel: [    9.936614] ath_hal: 0.9.18.0 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
Apr 19 11:47:21 manju-desktop kernel: [    9.958671] wlan: svn r4133 (branch madwifi-0.9.4)
Apr 19 11:47:21 manju-desktop kernel: [    9.975867] ath_pci: svn r4133 (branch madwifi-0.9.4)
Apr 19 11:47:21 manju-desktop kernel: [    9.975940] ath_pci 0000:02:04.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
Apr 19 11:47:21 manju-desktop kernel: [    9.976024] ath_pci: HAL doesn't support MAC revision 0xffffffff
Apr 19 11:47:21 manju-desktop kernel: [    9.976037] ath_pci 0000:02:04.0: PCI INT A disabled
 Output of lshw -C networklshw -C network
  *-network:1 UNCLAIMED
       description: Ethernet controller
       product: AR5413 802.11abg NIC
       vendor: Atheros Communications Inc.
       physical id: 4
       bus info: pci@0000:02:04.0
       version: 01
       width: 32 bits
       clock: 33MHz
       capabilities: pm cap_list
       configuration: latency=168 maxlatency=12 mingnt=10