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

[Bjorn Toft Madsen]

It's worth adding that in #1973359 (was closed as duplicate of this bug;
I was the author), the computer is plugged in with a barrel power plug,
not via USB-C PD. I'm not sure how it still ends up being routed as a
USB power source in /sys/class/power_supply. Specifically, it's this
computer: https://imgur.com/a/0nUFAFH ... so it's very much in "has
consistent power" range.

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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:
  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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