on_ac_power says false, but real answer is true

[Bjorn Toft Madsen]

On a Dell 7000 Micro (Intel 12700T), plugged into mains power, on_ac_power reports false.

As the micro computer is plugged into mains power, I had expected it instead to report true.

/sys/class/power_supply$ ls
ucsi-source-psy-USBC000:001

/sys/class/power_supply/ucsi-source-psy-USBC000:001$ cat type
USB

/sys/class/power_supply/ucsi-source-psy-USBC000:001$ cat online
0

The initial logic in /usr/bin/on_ac_power goes:
if [ -d /sys/class/power_supply/ ]; then
    for FN in /sys/class/power_supply/*; do
        if test -d "${FN}" && test -r "${FN}/type"; then
            type="$(cat "${FN}/type")"
            case "${type}" in
            Mains|USB*|BrickID|Wireless)
                if [ -r "${FN}/online" ]; then
                    online="$(cat "${FN}/online")"
                    [ "$online" = 1 ] && exit 0
                    [ "$online" = 0 ] && OFF_LINE_P=yes
                fi;;
            esac
        fi
    done
    [ "${OFF_LINE_P}" = "yes" ] && exit 1
fi

Due the adapter being of type USB and the online status being 0, OFF_LINE_P is set to "yes" and the script exits with status code 1.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: powermgmt-base 1.36
Uname: Linux 5.17.0-051700-generic x86_64
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
Date: Fri May 13 11:50:59 2022
Dependencies:

InstallationDate: Installed on 2022-04-22 (21 days ago)
InstallationMedia: Ubuntu-Server 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220421)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: powermgmt-base
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Max Gaukler (mgmax)]

Closing as duplicate of https://bugs.launchpad.net/ubuntu/+source/powermgmt-base/+bug/1980991 which is slightly newer but contains further discussion and even a suggested fix.