[Nut-upsdev] upsd flapping in the breeze

Arnaud Quette aquette.dev at gmail.com
Wed May 27 12:47:21 UTC 2009

2009/5/26 Arjen de Korte <nut+devel at de-korte.org <nut%2Bdevel at de-korte.org>>

> Citeren Daniel O'Connor <doconnor at gsoft.com.au>:
>  Note that I still have trouble starting mge-shut - 50+% of the time it
>> says "Unable to get Report Descriptor"
> Have you also tried the newmge-ups driver? Being based on the same core as
> the usbhid-ups (USB) driver, it may be a little more forgiving in case of
> timeouts (although I'm not very familiar with it's predecessor, mge-shut).

CAUTION: newmge-shut has still a major issue I haven't yet solved (which
explains why it has not yet superseded): a loss of synchronization tends to

The SHUT protocol is *very* verbose and uses a slow 2400 baud link, so you
> want to give it lots of time before giving up (reading a 1500+ bytes report
> descriptor will take more than 10 seconds). You may want to increase MAXAGE
> in upsd.conf to at least double that, to prevent PINGing the driver to
> death.

I still have a point in my TODO list which is the baudrate negotiation.
newer units supports it.
there are also rooms for improvement on the startup sequence.

Daniel: I'm interested in debug trace of these startup failure. just to see
how it fails, and what should be done.

Linux / Unix Expert R&D - Eaton - http://www.eaton.com/mgeops
Network UPS Tools (NUT) Project Leader - http://www.networkupstools.org/
Debian Developer - http://www.debian.org
Free Software Developer - http://arnaud.quette.free.fr/
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