How to debug USB hardware issues

[Alberto Mijares]

Hi Hans,

dmesg doesn't say anything when the failure occurs.

# sysctl hw.usb.no_cs_fail
sysctl: unknown oid 'hw.usb.no_cs_fail'

I turned on debugging in the modem driver

# sysctl hw.usb.u3g.debug=1
hw.usb.u3g.debug: 0 -> 1

However, I cannot recompile the kernel rigth now for USB_DEBUG.

I hope when the failure occurs again the driver be able to say what is
going on. I'll be posting the results here.

Thanks in advance.

Regards


Alberto Mijares

On 11/4/11, Hans Petter Selasky <hselasky at c2i.net> wrote:
> On Friday 04 November 2011 02:01:45 Alberto Mijares wrote:
>> Hi,
>>
>> I have a SMS gateway with FreeBSD 8.2 RELEASE on old hardware
>> (Pentium4). It has plugged a modem  Enfora SA-EL, GSM-GPRS, via USB.
>>
>> The modem has been working fine for years. However, since it's plugged
>> to this server, the application that manage the modem hangs every one
>> or two days.
>>
>> I'd like to know if there is a way to know exactly if the problem is
>> the USB ports or the modem failing (because has some years now). Some
>> time I have to reset the USB port (using usbconfig) and it works
>> again. Tha bad thing is that the application hangs and cannot reset
>> the modem (using the %RESET AT command).
>>
>> Thanks in advance for your suggestions.
>>
>> Regards
>>
>>
>> Alberto Mijares
>
> Hi,
>
> What does dmesg say when this failure occurs?
>
> Do you see the following sysctl:
>
> sysctl hw.usb.no_cs_fail
>
> I would start turn on debugging in the modem driver, compile kernel with
> options USB_DEBUG, and then see what is printed at the time of failure.
>
> --HPS
>