Comment 0 for bug 1980991

Good afternoon, folks.

I believe I discovered a bug in the /usr/sbin/on_ac_power script. I have a Dell OptiPlex 5090 host that has an entry in /sys/class/power_supply for "ucsi-source-psy-USBC000:001". I believe this is the USB-C power delivery port on the front of the chassis. The issue I'm encountering is that /usr/sbin/on_ac_power is exiting with code 1 which states: (1 (false) if not on AC power) when that isn't the case.

This looks to be because of the ucsi-source-psy-USBC000:001 entry reporting the "online" status as 0, presumably because nothing is currently connected to that USB-C port.

This causes /usr/sbin/on_ac_power to incorrectly report that the machine isn't connected to AC power and causes other utilities like unattended-upgrades to quit when using the default configuration since it believes the machine isn't connected to AC power.

There is a workaround with unattended-upgrades where you can specify it to run regardless of if AC power is connected, but as more and more chassis implement power-delivery USB-C ports I foresee this becoming more of an issue.

I'm not sure if it's anything to look into, but I figured I would share my findings. Please let me know if you have any questions or if I can provide any additional information, troubleshooting, or testing.

Thanks!
-Kevin