I don't think this is a regression. This driver was poor in jaunty as
well for me:

01:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network 
Adapter (rev 01)                                                                
                          
        Subsystem: D-Link System Inc Device 3a70                                
             
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR+ FastB2B- DisINTx-                                               
                              
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-                                                    
                          
        Latency: 0, Cache Line Size: 64 bytes                                   
             
        Interrupt: pin A routed to IRQ 28                                       
             
        Region 0: Memory at f8ff0000 (64-bit, non-prefetchable) [size=64K]      
             
        Capabilities: <access denied>                                           
             
        Kernel driver in use: ath9k                                             
             
        Kernel modules: ath9k      

The current kernel is definitely an improvement over jaunty either stock
or with backports. I no longer see the disassociations and with
wpa_supplicant the card sticks solidly to the access point. However it
does still just stop working several times a day and requires an ifdown
/ ifup to get it going again. This is a PCI-Express card btw, not sure
if that makes any difference.

-- 
ath9k disassociates/reassociates a lot
https://bugs.launchpad.net/bugs/414560
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