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I observed this behavior with several Powercom UPSs (BNT
400/600/1000) new and old on different computers. It didn't matter.
Even replacing USB cables or switching to another port didn't give
stable results. Only usbreset and immediately restarting/starting
the service gave about 90% result. Therefore, I slightly changed the
startup script in the system so that if the required
VendorID:DeviceID was available, this port would be restarted and
NUT would be started immediately.<br>
<br>
<div class="moz-cite-prefix">16.05.2025 11:16, Jim Klimov:<br>
</div>
<blockquote type="cite"
cite="mid:CAJYg8v+FYzsB9TtWjFaBvwBnxFy2W8s-UO15B-vaPuYtn5+5Fw@mail.gmail.com">
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<div dir="ltr">
<div>Well, it is always (quite) possible that the hardware is...
subpar, leading to loss of connection.</div>
<div><br>
</div>
<div>Try a different USB port (maybe on a different MoBo hub if
there's a choice), different cable (check if you have a
shielded/grounded one to minimize EMI noise), revise if there
are any motors (fridges, dishwashers) or luminescent lighting
starters etc. nearby on the electric line and physically near
the cabling, etc.</div>
<div><br>
</div>
<div>Maybe there is some vendor-provided way to update the UPS
firmware?</div>
<div><br>
</div>
<div>You mentioned the device may be from 2017 - maybe it
collected a lot of dust over time and just overheats or has
random static discharge inside - so some internal physical
maintenance with a toothbrush, vacuum cleaner, and proper
electrotechnical hygiene for your safety could also do
wonders? On similar note, is the battery also as old? PbAc
tend to not live that long, maybe replacing it could stabilize
things.</div>
<div><br>
</div>
<div>Jim</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Fri, May 16, 2025 at
9:41 AM Alexey Korobeinikov <<a
href="mailto:alexey@fseafood.com" moz-do-not-send="true"
class="moz-txt-link-freetext">alexey@fseafood.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> On Devuan Linux daedalus (no systemd).<br>
I try to manualy start nut-service or just usbhid-ups
drivers. I have observed such problems before.<span
lang="en"><span><span> They were solved by usbreset </span></span></span><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">on this
device (0d9f:0004</span>) and</span><span lang="en"><span><span>
immediately launch</span></span></span><span></span>
nut-service/drivers. But sometimes it wasn't necessary to do
that.<br>
<br>
<br>
<div>16.05.2025 00:01, Jim Klimov:<br>
</div>
<blockquote type="cite">
<div dir="auto">Are you on Linux? Did you check if NDE
created a service instance like `nut-driver@UPS` that
starts automatically and your manually started driver
instance tries to steal from it?
<div dir="auto"><br>
</div>
<div dir="auto">* <a
href="https://github.com/networkupstools/nut/wiki/nut%E2%80%90driver%E2%80%90enumerator-(NDE)"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://github.com/networkupstools/nut/wiki/nut%E2%80%90driver%E2%80%90enumerator-(NDE)</a></div>
<div dir="auto"><br>
</div>
<div dir="auto">Jim</div>
</div>
</blockquote>
<br>
<pre cols="72">--
З Повагою
Коробейніков Олексій
Системний адміністратор
ТОВ "Флагман Сіфуд"
вул. Броварська 152, смт Велика Димерка
Київська область, 07442
р.+38 044 495-88-00
вн.6101
м.+38 067 994-40-48</pre>
</div>
</blockquote>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
З Повагою
Коробейніков Олексій
Системний адміністратор
ТОВ "Флагман Сіфуд"
вул. Броварська 152, смт Велика Димерка
Київська область, 07442
р.+38 044 495-88-00
вн.6101
м.+38 067 994-40-48</pre>
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