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

[Gordon Lack]

I'm not the bug opener, but the main problem for *me* was with unattended-upgrades as I noticed it had stopped running (while my other systems were still updating).
But that is fixed (as it runs from systemd and the systemd AC power check was fixed in Lunar).

However, there are (at least) 3 crontab entries in /etc/cron.daily or
weekly  (apt-compat, plocate and apt-xapian-index) using on_ac_power
(although 2 of those don't run from cron if systemd is running...). This
isn't bothering me.

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

Status in powermgmt-base package in Ubuntu:
  Triaged
Status in powermgmt-base source package in Kinetic:
  Won't Fix
Status in powermgmt-base source package in Lunar:
  Triaged

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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