Hmmm... good questions... how do I find out?

This thing used to work so well that I never bothered to investigate.
The card is autodetected and everything set up automatically.

Having said this:
The wlan card should be this line from lspci:
04:02.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC 
(rev 01)

lspci -vv gives this output:
04:02.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC 
(rev 01)
        Subsystem: IBM Unknown device 057e
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- 
Stepping- SERR+ FastB2B+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 168 (2500ns min, 7000ns max), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 66
        Region 0: Memory at a8400000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=2 PME-

-- 
WPA does not work after upgrading to wpasupplicant 0.5.4-5
https://launchpad.net/bugs/56252

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