Arch Linux

Description:

The battery charging limit functionality of the lg_laptop module included with kernel 5.13.5 does not work with my LG gram (2021) laptop


Additional info:
* package version(s)

core/linux513 5.13.5-1 [installed]
The Linux513 kernel and modules

--- TLP 1.3.1 --------------------------------------------

+++ System Info
System = LG Electronics 0.1 15Z95N-G.AAC6U1
BIOS = T1ZF0220 X64
Release = "Manjaro Linux"
Kernel = 5.13.5-1-MANJARO #1 SMP PREEMPT Mon Jul 26 07:43:29 UTC 2021 x86_64
/proc/cmdline = BOOT_IMAGE=/@/boot/vmlinuz-5.13-x86_64 root=UUID=bc38ca56-b94f-4ffd-a945-4774f83da22d rw rootflags=subvol=@ quiet splash apparmor=1 security=apparmor udev.log_priority=3
Init system = systemd
Boot mode = UEFI


+++ Battery Status: CMB0
/sys/class/power_supply/CMB0/manufacturer = LG
/sys/class/power_supply/CMB0/model_name = LGC-LGC
/sys/class/power_supply/CMB0/cycle_count = 1
/sys/class/power_supply/CMB0/energy_full_design = 80000 [mWh]
/sys/class/power_supply/CMB0/energy_full = 78240 [mWh]
/sys/class/power_supply/CMB0/energy_now = 54320 [mWh]
/sys/class/power_supply/CMB0/power_now = 5226 [mW]
/sys/class/power_supply/CMB0/status = Discharging

Charge = 69.4 [%]
Capacity = 97.8 [%]



* config and/or log files etc.

lsmod | grep lg_laptop  ✔
lg_laptop 20480 0
sparse_keymap 16384 1 lg_laptop
wmi 36864 2 lg_laptop,wmi_bmof


* link to upstream bug report, if any

Steps to reproduce:

Once the module is loaded, I was trying to set the charge limit to 80 (stands for 80%)

cat /sys/devices/platform/lg-laptop/battery_care_limit

0

echo 80 > /sys/devices/platform/lg-laptop/battery_care_limit

cat /sys/devices/platform/lg-laptop/battery_care_limit

0

All other functionality that I care about works with this module.

Thanks.