Public bug reported:

On Samsung Series 9 laptops the battery state and the charger status are
incorrectly reported in kernel 4.15.

This bug is a regression: it has been fixed in 2012 [1] it used to work
fine until Linux 14.10 (included).

Quoting Matthew McCallum from
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971061/comments/161

> If I disconnect power, remove the back cover, disconnect both the main 
> battery and the backup battery, I am able to get power status updates (e.g. 
> battery will show as charging/charged when plugged in, or just regular 
> battery when not). Once I sleep, I have to repeat this process if I want the 
> battery status to work again.
>
> `acpi -p` correctly shows the charging state, but `tlp-stat -b` does not.

[1]
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971061/comments/159

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: kernel-bug suspend-resume

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https://bugs.launchpad.net/bugs/1792672

Title:
  Regression: acpi reports battery state incorrectly after sleep

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