Driver debugging

[Dan Williams]

On Mon, 2007-07-23 at 09:00 -0700, Bill Moseley wrote:
> I have new a Thinkpad T60p with an Atheros card running Ubuntu Feisty
> and wpa_supplicant 0.5.7-0ubuntu2.
> 
> A number of people have be posting on the NetworkManager list about
> frequent disconnects (and reconnects).  We don't believe it's a real
> signal drop out (I'm only a few feet from my AP and Linux (Sarge)
> running two different wireless cards) and an iBook have no trouble.
> 
> So, it was suggested on the NetworkManager list that we get some
> wpa_supplicant debugging logs to see exactly what the connection is
> being dropped.

No, not wpa_supplicant logs, but _driver_ logs.  From the madwifi kernel
modules.  That's what's sending the disconnect events, and knowing why
it's sending the disconnects is what we need to debug this further...

Dan

> Wireless on my Debian Sarge laptop has, well, just worked.  Plus, that
> was not using wpa_supplicant.  So, I'm a bit ignorant in how to debug
> past simple use of iwconfig/iwlist.
> 
> Could someone provide suggestions how to get the driver to generate
> useful debugging information?
> 
> Any other suggestions how to debug?
> 
> I thought about disabling NetworkManager and use a manual
> configuration, but I'm not sure how to know if/when the connection
> drops.  NetworkManager has the nm-applet that makes it very obvious
> when the connection drops and reconnects.
> 
> 
> 
>           Cell 01 - Address: 00:09:5B:B3:C7:18
>                     ESSID:"hanklan"
>                     Mode:Master
>                     Frequency:2.412 GHz (Channel 1)
>                     Quality=36/70  Signal level=-59 dBm  Noise level=-95 dBm
>                     Encryption key:on
>                     Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
>                               9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
>                               48 Mb/s; 54 Mb/s
>                     Extra:bcn_int=100
>                     IE: WPA Version 1
>                         Group Cipher : TKIP 
>                         Pairwise Ciphers (1) : TKIP 
>                         Authentication Suites (1) : PSK  
> 
> 
> 03:00.0 Network controller: Atheros Communications, Inc. Unknown device 0024 (rev 01)
>         Subsystem: Atheros Communications, Inc. Unknown device 0033
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
>         Latency: 0, Cache Line Size: 64 bytes
>         Interrupt: pin A routed to IRQ 22
>         Region 0: Memory at edf00000 (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 Legacy Endpoint IRQ 0
>                 Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag-
>                 Device: Latency L0s <512ns, L1 <64us
>                 Device: AtnBtn- AtnInd- PwrInd-
>                 Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
>                 Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
>                 Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
>                 Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1, Port 0
>                 Link: Latency L0s <512ns, L1 <64us
>                 Link: ASPM L0s L1 Enabled RCB 128 bytes CommClk+ ExtSynch-
>                 Link: Speed 2.5Gb/s, Width x1
>         Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
>                 Vector table: BAR=0 offset=00000000
>                 PBA: BAR=0 offset=00000000
> 
> 
>