debcrafters-packages team mailing list archive

[Nick Rosbrook <2112342@xxxxxxxxxxxxxxxxxx>]

Hm, I am not sure we want to change the default here. The flip side of
your experience is that for users with batteries in good health,
shutting down too soon could be frustrating. The default cannot please
everyone, but that's why it's configurable.

I think that configuring an override (as you have done here) on an as-
needed basis is the best thing to do.

** Changed in: upower (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2112342

Title:
  UPower default PercentageAction=2.0 is too aggressive for degraded
  batteries — suggest changing to 5.0%

Status in upower package in Ubuntu:
  Incomplete

Bug description:
  Affected system:
  Laptop: Lenovo ThinkPad T490
  Ubuntu versions tested: Ubuntu 24.04 LTS and Ubuntu 25.04
  Battery condition: Moderate degradation (~36% capacity loss)

  upower:
    Installed: 1.90.7-1build1

  energy-full:         32.35 Wh
  energy-full-design:  50.5 Wh
  capacity:            64.06%

  On this system, when the battery level dropped to ~2%, the system
  attempted to perform a shutdown as configured by UPower default:

  PercentageAction=2.0

  However, due to the degraded state of the battery, the voltage dropped
  too rapidly at that level for the system to complete the shutdown
  properly. This resulted in a system freeze with a blinking Caps Lock
  LED, indicative of a kernel panic caused by power failure during a
  critical system operation.

  This issue occurred reliably and repeatedly on both Ubuntu 24.04 and
  25.04.

  Diagnosis:
  1. The battery has significantly reduced capacity (~64% of design).
  2. At 2% reported charge, there was insufficient residual energy to allow the shutdown process to complete.
  3. Increasing the threshold for the shutdown action to 5% resolved the issue completely.

  Solution:
  I edited the file /etc/UPower/UPower.conf and changed the following lines:

  PercentageLow=20.0
  PercentageCritical=10.0
  PercentageAction=5.0

  
  I also restarted the service:

  sudo systemctl restart upower

  
  After this change, the system reliably enters CriticalPowerAction when the battery reaches 5%, with no further freezes or panics.

  
  Suggested change to default UPower configuration:

  PercentageAction=5.0

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