Battery charge control for MSI Thin GF63 12UCX

[dereck449]

Laptop model: MSI Thin GF63 12UCX
BIOS: E16R8IMS.10E
Kernel: Linux 6.18.18-1-MANJARO
isw version: 1.9.1

Battery charge control found

After reverse engineering the EC memory dump by comparing charging vs discharging states byte by byte, I found the address that controls battery charging:

• Address: 0x30 (byte48)
• Value when charging: 3 (0x03)
• Value when not charging: 2 (0x02)

Commands

Stop charging (while AC connected):

sudo isw -s 30 2

Resume charging:

sudo isw -s 30 3

Notes

• Requires ec_sys module with write support: sudo modprobe ec_sys write_support=1
• Tested with AC adapter connected, battery successfully stopped charging at command
• KDE power manager correctly reports "Discharging" state when charge is stopped

Hope this helps add support for this model. Happy to provide full EC dumps if needed.