Troubleshooting USB CyberPower PowerPanel Issues on Linux

1. Check UPS Connection

Verify if the UPS is recognized as a USB device:

dmesg | grep -i usb

2. Review pwrstatd Logs

Check for any errors in the pwrstatd log:

cat /var/log/pwrstatd.log

3. Verify Daemon Connections

Use lsof to confirm pwrstatd connections:

sudo lsof -p $(pgrep pwrstatd)

Ensure pwrstatd is communicating with the hiddev device rather than ttyS or ttyUSB.

4. Configure pwrstatd.conf File

Update the /etc/pwrstatd.conf file to use the correct device:

allowed-device-nodes = /dev/hiddev0

5. Restart pwrstatd Service

Restart the service to apply changes:

sudo systemctl restart pwrstatd

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Credit: major.io