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With the default CriticalPowerAction=Auto and no hibernation, UPower suspends at 2%, and the device keeps draining in s2idle until the battery is flat. On the Lenovo Legion Tab Gen 3 it then stayed dead on the charger, with no sign of life for half an hour, until a forced reset (holding the buttons) brought it back. Power off at 3% instead (critical warning at 6%).
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With the default
CriticalPowerAction=Autoand no hibernation, UPower resolves the critical action toa suspend (
GetCriticalActionreturnsSleep), so at 2% the device goes to sleep and keeps drainingin s2idle until the battery is flat. On the Lenovo Legion Tab Gen 3 it then stayed dead on the
charger, with no sign of life for half an hour, until a forced reset (holding the buttons) brought it
back. This powers off at 3% instead (critical warning at 6%).
On the TB321FU port I also wake the device from s2idle with the PMIC RTC to re-check the battery
(power off at 5%, otherwise sleep again); the RTC that can wake differs per SoC, so that part stays in
the port, but I can propose a generic version if it's of interest.
AI assistance
Claude Opus 5.5, with review and on-device testing by me.