[Nut-upsuser] New UPS Support: Eaton 5S 1000

Ken Marsh ken.marsh at sparkpost.com
Fri May 6 17:22:40 UTC 2016

Hmm. Next week I'll experiment with different cables, and see if I can find
a hub.

These results are the same on two different hosts, two different 5S 1000LCD
UPS's, each with their own OEM cable, which is a bit thicker and more
substantial looking than the ones that came with the Eaton 5110 aka
Powerware 1000i. So while both cables may be bad, it's starting to look
like this model UPS may have a flawed USB design?!


On Thu, May 5, 2016 at 10:22 PM, Charles Lepple <clepple at gmail.com> wrote:

> On May 5, 2016, at 9:25 AM, Ken Marsh <ken.marsh at sparkpost.com> wrote:
> >
> > Well, whaddya know, when run with -DDDDD it works! upsc consistently
> returns data. Maybe it's a timing thing, or a select affected by I/O or
> something tricky like that. Nonetheless, I ran it, hit upsc eaton multiple
> times, collected the output and attached it. If this doesn't give you what
> you need, I can retry with fewer/more D's or whatever you like.
> Probably is timing, then. See below.
> > I couldn't find any crashes in dmesg, just this over and over:
> >
> > [167914.284728] usb 6-1: USB disconnect, device number 21
> > [167915.292292] usb 6-1: new low-speed USB device number 22 using
> uhci_hcd
> This part isn't good. While the usbhid-ups can attempt to recover from
> this, it means that for a second at a time (those times in brackets are
> seconds since boot), the UPS is logically disconnected from the USB bus.
> (This is what happens if you have a phone with a worn-out USB connector,
> and it beeps if you wiggle the plug.) After it reconnects, due to the low
> bit-rate of low-speed USB, it takes 5-10 seconds for the driver to
> reconnect.
> Some people have reported success with higher-quality USB cables (2.0
> rated, even though the UPS will never use the faster modes). Others have
> moved the cable to a non-3.0 port. A hub might also clean up the signal,
> but then you need to make sure the hub power supply is on battery as well.
> You should only see the "new low-speed USB device" message once for the
> UPS, when it is first plugged in (or when the system is booted).
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