https://bugzilla.kernel.org/show_bug.cgi?id=67251

--- Comment #1 from AZ <form...@gmail.com> ---
Hit <enter> too soon. Appending with information:

ls -l /sys/class/power_supply/ACAD/device/
total 0
lrwxrwxrwx. 1 root root    0 Dec 17 14:51 driver ->
../../../../bus/acpi/drivers/ac
-r--r--r--. 1 root root 4096 Dec 17 15:50 hid
-r--r--r--. 1 root root 4096 Dec 17 15:50 modalias
-r--r--r--. 1 root root 4096 Dec 17 15:50 path
drwxr-xr-x. 2 root root    0 Dec 17 15:50 power
drwxr-xr-x. 3 root root    0 Dec 17 09:51 power_supply
lrwxrwxrwx. 1 root root    0 Dec 17 14:51 subsystem -> ../../../../bus/acpi
-rw-r--r--. 1 root root 4096 Dec 17 09:51 uevent

-- while on the battery only:
 udevadm info --path=/sys/class/power_supply/ACAD
P: /devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/ACAD
E: DEVPATH=/devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/ACAD
E: POWER_SUPPLY_NAME=ACAD
E: POWER_SUPPLY_ONLINE=0
E: SUBSYSTEM=power_supply


--pluing and unplugin AC produces:
udevadm monitor --subsystem-match=power_supply
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[3841.282073] change  
/devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/ACAD (power_supply)
UDEV  [3841.289449] change  
/devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/ACAD (power_supply)
KERNEL[3848.428923] change  
/devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/ACAD (power_supply)
UDEV  [3848.432268] change  
/devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/ACAD (power_supply)

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