[Nut-upsuser] [EXTERNAL] Re: UPS Losing Connection

David Zomaya David_Zomaya at tripplite.com
Thu Sep 24 18:01:30 BST 2020

Not a whole lot to do in the field for a legitimate USB not responding issue other than verify cabling and give a power cycle and/or discharge reset a try (which, given the nature of a UPS isn't always something you can easily do of course).

If it looks like a problem with USB being completely dead, as opposed to just the "drops" issue we started with, I definitely recommend contacting support.

From: Kirk Bocek <t004 at kbocek.com>
Sent: Thursday, September 24, 2020 11:53 AM
To: David Zomaya; Stuart D. Gathman
Cc: nut-upsuser at lists.alioth.debian.org
Subject: Re: [EXTERNAL] Re: [Nut-upsuser] UPS Losing Connection

On 9/24/2020 9:05 AM, David Zomaya wrote:
> Update from my end:
> I found the old thread where I posted a possible resolution for a similar issue on CentOS 7.6 with the same protocol (2012):
>  https://urldefense.proofpoint.com/v2/url?u=https-3A__alioth-2Dlists.debian.net_pipermail_nut-2Dupsuser_2019-2DJune_011451.html&d=DwICaQ&c=f9s1WCuF-N6cmD_YaZ7gBg&r=lhr3k4au5dVQgHY_iS-v_t9g8PHVkn8Px_wyaupZGfQ&m=Mk4enQyHH_ktS46pXqu47MyyIUG2duzJx8eyvQjcoBU&s=f0uW9O7ZL0GsIVuqpXTyQTMTcwD5FGa7rntSNtErR8c&e=
>  https://urldefense.proofpoint.com/v2/url?u=https-3A__alioth-2Dlists.debian.net_pipermail_nut-2Dupsdev_2019-2DJune_007440.html&d=DwICaQ&c=f9s1WCuF-N6cmD_YaZ7gBg&r=lhr3k4au5dVQgHY_iS-v_t9g8PHVkn8Px_wyaupZGfQ&m=Mk4enQyHH_ktS46pXqu47MyyIUG2duzJx8eyvQjcoBU&s=CL5p7NIqJwtlfJZeV359EdkXz73uEaSfWAizbSGHc1k&e=
> Some of my initial steps were probably unnecessary, but through a combination of configuration tweaks and udev rules, the drops seemed to go away.
> Of course, if the USB port is not responding at all, that is a separate issue (is there another computer/cable to verify that with?). You should contact tech support if that ends up being the case:
> https://www.tripplite.com/support/help
> (I'm no longer on the tech support team so I couldn't help directly with an RMA if needed)
> Thank you,
> David Zomaya
> Tripp Lite

I plugged the USB into another host and nothing. Not in lsusb output. No
hotplug messages in the ring buffer.

So is this a busted unit? Is there anyway to reset the USB on the UPC
without power cycling everything attached to it?

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