LG Gram laptop extra features¶
By Matan Ziv-Av <firstname.lastname@example.org>
The following FN keys are ignored by the kernel without this driver:
FN-F1 (LG control panel) - Generates F15
FN-F5 (Touchpad toggle) - Generates F21
FN-F6 (Airplane mode) - Generates RFKILL
FN-F9 (Reader mode) - Generates F14
The rest of the FN keys work without a need for a special driver.
Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables reader mode. In this mode the screen colors change (blue color reduced), and the reader mode indicator LED (on F9 key) turns on.
Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables FN lock.
Battery care limit¶
Writing 80/100 to /sys/class/power_supply/CMB0/charge_control_end_threshold sets the maximum capacity to charge the battery. Limiting the charge reduces battery capacity loss over time.
This value is reset to 100 when the kernel boots.
Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables the fan silent mode.
Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables charging another device from the USB port while the device is turned off.
This value is reset to 0 when the kernel boots.
The are two LED devices supported by the driver:
A led device named kbd_led controls the keyboard backlight. There are three lighting level: off (0), low (127) and high (255).
The keyboard backlight is also controlled by the key combination FN-F8 which cycles through those levels.
Touchpad indicator LED¶
On the F5 key. Controlled by led device names tpad_led.