I am seeing the same errors (unsupported jumbo) and poor wifi performance on a 
good network with 
Karmic/Mythbuntu Alpha 6.  The hardware is Acer Revo 3600

lspci -vv

05:00.0 Ethernet controller: Atheros Communications Inc. AR5001 Wireless 
Network Adapter (rev 01)
        Subsystem: Foxconn International, Inc. Device e008
        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 19
        Region 0: Memory at febf0000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: ath5k
        Kernel modules: ath5k

-- 
juanty ath5k : disconnection / slow network
https://bugs.launchpad.net/bugs/369005
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