[Nut-upsuser] CP1500AVRLCD NOCOMM

[Lane Russell]

​​
Ubuntu Server 16.04.1 LTS
NUT 2.7.2-4ubuntu1
NUT installed from apt
CP1500AVRLCDa
Complete problem description, with any relevant traces, like system log
excerpts, and driver debug output. You can obtain the latter using the
following command, as root and after having stopped NUT:

Problem Description:
Ubuntu is able to communicate fine with the ups for several hours. However,
the UPS is consistently going stale after a few hours. At that point, I
have either manually reconnect the cable, or restart the driver. Both fix
the issue for a few hours, but the cycle repeats.

Things I have tried:
Different USB cable
Different USB port on server
Reducing POLLFREQ & POLLFREQALERT from 5s to 10s

Output of sudo upsdrvctl -D start:
Network UPS Tools - UPS driver controller 2.7.2
  0.000000 Starting UPS: ups
Network UPS Tools - Generic HID driver 0.38 (2.7.2)
USB communication driver 0.32
Using subdriver: CyberPower HID 0.3


Syslog after server loses sight of UPS:
Oct  6 17:29:01 kvm usbhid-ups[3529]: libusb_get_string: error sending
control message: Broken pipe
Oct  6 17:30:53 kvm upsd[3533]: Data for UPS [ups] is stale - check driver
Oct  6 17:30:57 kvm upsmon[3548]: Poll UPS [ups at localhost] failed - Data
stale
Oct  6 17:30:57 kvm upsmon[3548]: Communications with UPS ups at localhost lost
Oct  6 17:30:57 kvm upssched[32410]: Executing command: notifycommbad
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