[LG Gram] battery_care_limit inactive

[alexyao2015]

[x] I've read and accepted the Bug Reporting Howto
[x] I've provided all required tlp-stat outputs via Gist (see below)

Describe the bug
I recently purchased a current gen LG gram and am attempting to use tlp, but see an inactive message when running tlp-stat.

Expected behavior
TLP to function correctly.

To Reproduce
Presumably, some kernel features are missing, but I'm not sure where this should be reported. Attempting to manually set the battery care limit also gives an error. Let me know what other diagnostics would be useful, if any.

echo 80 | sudo tee /sys/devices/platform/lg-laptop/battery_care_limit
80
tee: /sys/devices/platform/lg-laptop/battery_care_limit: Input/output error

Does the problem occur on battery or AC or both? Both

tlp-stat -b
--- TLP 1.6.1 --------------------------------------------

+++ Battery Care
Plugin: lg-legacy
Supported features: none available
Driver usage:
* vendor (lg_laptop) = inactive (laptop not supported)

+++ Battery Status: BAT0
/sys/class/power_supply/BAT0/manufacturer                   =  LG 
LGys/class/power_supply/BAT0/model_name                     = LGES
/sys/class/power_supply/BAT0/cycle_count                    =      1
/sys/class/power_supply/BAT0/energy_full_design             =  77020 [mWh]
/sys/class/power_supply/BAT0/energy_full                    =  79800 [mWh]
/sys/class/power_supply/BAT0/energy_now                     =  76800 [mWh]
/sys/class/power_supply/BAT0/power_now                      =   8355 [mW]
/sys/class/power_supply/BAT0/status                         = Discharging

Charge                                                      =   96.2 [%]
Capacity                                                    =  103.6 [%]

[linrunner]

Duplicate of #747

Your problem is already known. As the output shows, TLP is not the cause, but kernels > 6.8 have a regression/are defective. I'll close here, you can follow the progress in the other issue and contribute there if possible.