Re: Re-scanning for available devices/connections after failure

On Thu, Jul 22, 2010 at 19:20, Dan Williams <dcbw redhat com> wrote:
> That is, well, unfortunate...  Sierra firmware is usually top-notch so
> I'd consider firmware crashes to be less of an issue here than with say
> Huawei or ZTE devices.  But they still could be an issue.  If there's
> any way we can get logs from the devices at all, that would be
> excellent.
> But as a workaround, you could use a watchdog that sends a USB reset to
> the device if it isn't seen in ModemManager for more than 30 seconds.
> There are some Python examples that list modems here:
> and that coupled with echoing some stuff to sysfs might be enough to
> shoot the modem in the head and get it to re-enumerate.
> If there's *any* way we can get 'dmesg' or /var/log/messages from the
> system when this happens that would help a lot.
> Dan
Right now I have a watchdog that restarts NM or reboots if it fails a
few times. I'll see what I can put together with the usb reset. I
thought such a thing might be possible but I didn't find anything. I
tried using /sys/bus/usb/.../power, but it didn't seem to do anything.
I'll see if I can have the watchdog also take a snapshot of the
logfiles and then I can pull them when it comes back up.

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