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

[Simon Chopin]

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rahme/ubuntu/+source/powermgmt-base/+git/powermgmt-base/+merge/466231

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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:
  Triaged
Status in powermgmt-base source package in Focal:
  Confirmed
Status in powermgmt-base source package in Jammy:
  Confirmed
Status in powermgmt-base source package in Kinetic:
  Won't Fix
Status in powermgmt-base source package in Lunar:
  Won't Fix
Status in powermgmt-base source package in Mantic:
  Confirmed
Status in powermgmt-base source package in Noble:
  Confirmed
Status in powermgmt-base source package in Oracular:
  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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