GPD WIN Max 2023 support

[PhE]

I would like your great project work on my GP WIN Max 2023

(should also work for the more recent 2025 model)

❯ batctl detect
Vendor:  GPD
Product: G1619-04
Backend: none detected (no supported battery backend detected)

OS: Ubuntu LTS GNU/Linux
batctl version: 2026.3.11

[Ooooze]

Thanks for the interest! GPD devices don't have a dedicated kernel driver for charge thresholds yet, so batctl can't detect a backend.

Could you check if the standard sysfs files exist?

ls /sys/class/power_supply/BAT*/charge_control_*
If they do — batctl's generic backend should work, and this is a detection bug. If not — it's a firmware/kernel limitation.

You might also want to check out GPD-LinuxControls — a reverse-engineered tool for GPD hardware that might expose charge control through the EC.

[PhE]

Nothing in /sys/class/power_supply/BAT*/charge_control_*, but ...

❯ sudo ls -l /sys/class/power_supply/*/*
lrwxrwxrwx 1 root root    0 Mar 11 19:07 /sys/class/power_supply/ADP1/device -> ../../../ACPI0003:00
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/ADP1/online
lrwxrwxrwx 1 root root    0 Mar 11 19:07 /sys/class/power_supply/ADP1/subsystem -> ../../../../../class/power_supply
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/ADP1/type
-rw-r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/ADP1/uevent
-rw-r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/alarm
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/capacity
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/capacity_level
-r--r--r-- 1 root root 4096 Mar 11 19:24 /sys/class/power_supply/BAT0/charge_full
-r--r--r-- 1 root root 4096 Mar 11 19:24 /sys/class/power_supply/BAT0/charge_full_design
-r--r--r-- 1 root root 4096 Mar 11 19:24 /sys/class/power_supply/BAT0/charge_now
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/current_now
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/cycle_count
lrwxrwxrwx 1 root root    0 Mar 11 19:07 /sys/class/power_supply/BAT0/device -> ../../../PNP0C0A:00
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/manufacturer
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/model_name
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/present
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/serial_number
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/status
lrwxrwxrwx 1 root root    0 Mar 11 19:07 /sys/class/power_supply/BAT0/subsystem -> ../../../../../../class/power_supply
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/technology
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/type
-rw-r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/uevent
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/voltage_min_design
-r--r--r-- 1 root root 4096 Mar 11 19:25 /sys/class/power_supply/BAT0/voltage_now

/sys/class/power_supply/ADP1/hwmon0:
lrwxrwxrwx 1 root root    0 Mar 11 19:07 device -> ../../ADP1
-r--r--r-- 1 root root 4096 Mar 11 19:25 name
drwxr-xr-x 2 root root    0 Mar 11 19:25 power
lrwxrwxrwx 1 root root    0 Mar 11 19:07 subsystem -> ../../../../../../class/hwmon
-rw-r--r-- 1 root root 4096 Mar 11 19:25 uevent

/sys/class/power_supply/ADP1/power:
-rw-r--r-- 1 root root 4096 Mar 11 19:25 async
-rw-r--r-- 1 root root 4096 Mar 11 19:25 autosuspend_delay_ms
-rw-r--r-- 1 root root 4096 Mar 11 19:25 control
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_active_kids
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_active_time
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_enabled
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_status
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_suspended_time
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_usage
-rw-r--r-- 1 root root 4096 Mar 11 19:25 wakeup
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_abort_count
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_active
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_active_count
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_count
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_expire_count
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_last_time_ms
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_max_time_ms
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_total_time_ms

/sys/class/power_supply/ADP1/wakeup36:
-r--r--r-- 1 root root 4096 Mar 11 19:25 active_count
-r--r--r-- 1 root root 4096 Mar 11 19:25 active_time_ms
lrwxrwxrwx 1 root root    0 Mar 11 19:09 device -> ../../ADP1
-r--r--r-- 1 root root 4096 Mar 11 19:25 event_count
-r--r--r-- 1 root root 4096 Mar 11 19:25 expire_count
-r--r--r-- 1 root root 4096 Mar 11 19:25 last_change_ms
-r--r--r-- 1 root root 4096 Mar 11 19:25 max_time_ms
-r--r--r-- 1 root root 4096 Mar 11 19:25 name
-r--r--r-- 1 root root 4096 Mar 11 19:25 prevent_suspend_time_ms
lrwxrwxrwx 1 root root    0 Mar 11 19:07 subsystem -> ../../../../../../class/wakeup
-r--r--r-- 1 root root 4096 Mar 11 19:25 total_time_ms
-rw-r--r-- 1 root root 4096 Mar 11 19:25 uevent
-r--r--r-- 1 root root 4096 Mar 11 19:25 wakeup_count

/sys/class/power_supply/BAT0/hwmon2:
-r--r--r-- 1 root root 4096 Mar 11 19:25 curr1_input
lrwxrwxrwx 1 root root    0 Mar 11 19:07 device -> ../../BAT0
-r--r--r-- 1 root root 4096 Mar 11 19:25 in0_input
-r--r--r-- 1 root root 4096 Mar 11 19:25 name
drwxr-xr-x 2 root root    0 Mar 11 19:25 power
lrwxrwxrwx 1 root root    0 Mar 11 19:07 subsystem -> ../../../../../../../class/hwmon
-rw-r--r-- 1 root root 4096 Mar 11 19:25 uevent

/sys/class/power_supply/BAT0/power:
-rw-r--r-- 1 root root 4096 Mar 11 19:25 async
-rw-r--r-- 1 root root 4096 Mar 11 19:25 autosuspend_delay_ms
-rw-r--r-- 1 root root 4096 Mar 11 19:25 control
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_active_kids
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_active_time
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_enabled
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_status
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_suspended_time
-r--r--r-- 1 root root 4096 Mar 11 19:25 runtime_usage