I have same problem on debian. Latest updates.

uname -a
Linux t42 2.6.32-5-686 #1 SMP Sat Oct 30 22:47:19 UTC 2010 i686 GNU/Linux

[  998.489386] ath5k phy0: noise floor calibration failed (2412MHz)
[  998.913401] ath5k phy0: noise floor calibration failed (2417MHz)
[  999.341718] ath5k phy0: noise floor calibration failed (2422MHz)
[ 1038.489290] ath5k phy0: noise floor calibration failed (2412MHz)
[ 1038.921328] ath5k phy0: noise floor calibration failed (2417MHz)
[ 1039.349289] ath5k phy0: noise floor calibration failed (2422MHz)
[ 1098.489465] ath5k phy0: noise floor calibration failed (2412MHz)
[ 1098.917485] ath5k phy0: noise floor calibration failed (2417MHz)
[ 1099.349566] ath5k phy0: noise floor calibration failed (2422MHz)

lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux testing (squeeze)
Release:        testing
Codename:       squeeze

lspci -vv

02:02.0 Ethernet controller: Atheros Communications Inc. AR5212 802.11abg NIC 
(rev 01)
        Subsystem: Phillips Components Device 8331
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- 
Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 168 (2500ns min, 7000ns max), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 11
        Region 0: Memory at c0210000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=2 PME-
        Kernel driver in use: ath5k


** Also affects: debian
   Importance: Undecided
       Status: New

-- 
ath5k phy0: noise floor calibration *failed* (not *timeout*)
https://bugs.launchpad.net/bugs/435808
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