Kyle - excellent find, I have confirmed that this was the cause of my
issue, too. Thank you!

I had taken a quick glance at /etc/apcupsd/apcupsd.conf when I was
failing to see communication working with my UPS, as I saw the expected
lines to configure apcupsd for USB mode I had assumed there was a deeper
problem and never got around to looking at it again. To confirm, the
config contains these lines by default:

UPSTYPE usb
DEVICE /dev/ttyS0

I commented out the 'DEVICE' line like so:

UPSTYPE usb
#DEVICE /dev/ttyS0

Then I restarted the service with:

# sudo systemctl restart apcupsd

I no longer see the IRQ messages in dmesg output. Great! Does this apply
to everyone else that has encountered this, I wonder?

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https://bugs.launchpad.net/bugs/1781016

Title:
  Slow flood of do_IRQ: No irq for vector

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