Comment 4 for bug 1980991

Possibly this?

--- /bin/on_ac_power 2019-07-20 16:43:51.000000000 +0100
+++ ./on_ac_power 2022-09-22 01:44:53.412558622 +0100
@@ -28,6 +28,17 @@
            type="$(cat "${FN}/type")"
            case "${type}" in
            Mains|USB*|BrickID|Wireless)
+# If USB, is it input or output?
+#
+ case "${type}" in
+ USB*)
+ if test -r "${FN}/usb_type"; then
+ usb_type=`cat "${FN}/usb_type"`
+ case "${usb_type}" in
+ *PD*) continue ;;
+ esac
+ fi
+ esac
                if [ -r "${FN}/online" ]; then
                    online="$(cat "${FN}/online")"
                    [ "$online" = 1 ] && exit 0

(sorry - the indentation spaces after any + are being eaten)