https://bugzilla.kernel.org/show_bug.cgi?id=215651
Bug ID: 215651
Summary: Battery charge limit is reset on every boot on ASUS
laptops
Product: ACPI
Version: 2.5
Kernel Version: 5.16.10/any
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Battery
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Description:
I have an ASUS TUF laptop that allows setting a battery charge limit. But, one
has to re-set this value on every reboot for it to be used.
This causes tools like Powerdevil in KDE Plasma to not work correctly since
they assume, that once the value is set, it is remembered until a change
happens.
This commit is likely the culprit
https://github.com/torvalds/linux/commit/7973353e92ee1e7ca3b2eb361a4b7cb66c92abee#diff-38095ba4871836b9eeaa6e1904739d398da72cda890e5ef932daec2995579db3R429-R434
as it says that the value is reset on every reboot.
Additional info:
* Originally reported on 5.16.10 but applies to every version
* Links:
bad commit?:
https://github.com/torvalds/linux/commit/7973353e92ee1e7ca3b2eb361a4b7cb66c92abee#diff-38095ba4871836b9eeaa6e1904739d398da72cda890e5ef932daec2995579db3R429-R434
KDE bug tracker: https://bugs.kde.org/show_bug.cgi?id=450551
Arch Linux bug tracker: https://bugs.archlinux.org/task/73996
Steps to reproduce:
0. Have an ASUS laptop
1. echo 60 > /sys/class/power_supply/BAT0/charge_control_end_threshold
2. reboot
3. the value is reset to 100
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