Some firmwares and battery controllers have a setting to prevent leaving
the battery fully charged for extended periods of time. This is supposed
to slow down battery life degradation.
Have you checked if such a setting is enabled in the machine's bios/uefi
firmware?
> is not related to any charge threshold settings that I have knowingly
configured.
Is something else setting a charge threshold?
cat /sys/class/power_supply/*/charge_{end,stop}_threshold
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2116870
Title:
Battery charge regularly stuck at 90%
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https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/2116870/+subscriptions
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