I have the same problem of Wireless LED not working with HP dv6700 laptop. It is always orange. It should turn blue when Wireless is on ( works as expected in Windoze )

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output of uname -a
Linux vijayk-laptop 2.6.27-7-generic #1 SMP Tue Oct 14 18:40:44 UTC 2008 i686 GNU/Linux
root@vijayk-laptop:# cat /etc/issue
Ubuntu intrepid (development branch) \n \l
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output of lspci -vvv ( wireless section alone )
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03:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg Wireless PCI Express Adapter (rev 01)
        Subsystem: Hewlett-Packard Company Device 137a
        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 f6000000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: [40] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable-
                Address: 00000000  Data: 0000
        Capabilities: [60] Express (v1) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <64us
                        ClockPM- Suprise- LLActRep- BwNot-
                LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
                Vector table: BAR=0 offset=00000000
                PBA: BAR=0 offset=00000000
        Capabilities: [100] Advanced Error Reporting <?>
        Capabilities: [140] Virtual Channel <?>
        Kernel driver in use: ath5k_pci
        Kernel modules: ath_pci, ath5k

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Output of dmesg | grep 'ath'
[   66.628870] ath5k_pci 0000:03:00.0: PCI INT A -> Link[LK4E] -> GSI 19 (level, low) -> IRQ 19
[   66.628951] ath5k_pci 0000:03:00.0: setting latency timer to 64
[   66.628976] ath5k_pci 0000:03:00.0: registered as 'phy0'
[   66.633824] ath5k phy0: Support for RF2425 is under development.
[   67.003757] ath5k phy0: Atheros AR2425 chip found (MAC: 0xe2, PHY: 0x70)
[   67.020476] ath_hal: 0.9.18.0 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
[   67.039454] ath_pci: 0.9.4
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Plese feel free to ask any other information that may help to resolve this issue.