[Bug 2085812] Re: TLP erroneously putting desktop PC in battery mode

[Jason Harvey]

Found the cause:
https://github.com/linrunner/TLP/issues/768#issuecomment-2443358201

It is due to the UCSI driver, which TLP is interpreting as a power
source. Since it sees no other AC sources, it assumes the system is on
battery.

This would be fixable by setting `TLP_PS_IGNORE="USB"` in the config
file, but I am wondering if there is some way the logic could be
adjusted to handle this correctly by default. It would be easily for
someone to accidentally end up in this state, leading to performance
problems plaguing them with no clear cause.

Anyone on a desktop PC that happens to have a UCSI driver loaded will
experience this by default, as Oracular appears to install TLP by
default.

** Bug watch added: tlp (upstream) #768
   https://github.com/linrunner/TLP/issues/768

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https://bugs.launchpad.net/bugs/2085812

Title:
  TLP erroneously putting desktop PC in battery mode

Status in tlp package in Ubuntu:
  New

Bug description:
  TLP on my desktop PC (with no battery) is putting the system into
  battery mode. This results in symptoms like the disk spinning down
  whenever it is idle for 15 seconds, which happens constantly.

  This is a new symptom with an upgrade to Oracular - I ran this same
  system on Jammy before and did not have this symptom.

  I believe this may be due to TLP seeing a battery "power supply"
  device for UCSI.

  tlp-stat output: https://gist.github.com/alienth/60f3b53004d7849f1906241ec1868550
  tlp-stat --psup output: https://gist.github.com/alienth/55ff4f906b5fd1d3e94f1b7ae8e7e819

  Filed a bug with the upstream:
  https://github.com/linrunner/TLP/issues/768

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