[Bug 1980991] Re: /usr/sbin/on_ac_power incorrectly reporting ac power status

[Gordon Lack]

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)

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https://bugs.launchpad.net/bugs/1980991

Title:
  /usr/sbin/on_ac_power incorrectly reporting ac power status

Status in powermgmt-base package in Ubuntu:
  Confirmed
Status in powermgmt-base source package in Kinetic:
  Confirmed

Bug description:
  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

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