LG Gram laptop extra features¶

Hotkeys¶

The following FN keys are ignored by the kernel without this driver:

FN-F1 (LG control panel) - Generates F15
FN-F5 (Touchpad toggle) - Generates F13
FN-F6 (Airplane mode) - Generates RFKILL
FN-F8 (Keyboard backlight) - Generates F16. This key also changes keyboard backlight mode.
FN-F9 (Reader mode) - Generates F14

The rest of the FN keys work without a need for a special driver.

Reader mode¶

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.

FN Lock¶

Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables FN lock.

Battery care limit¶

Writing 80/100 to /sys/devices/platform/lg-laptop/battery_care_limit 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.

Fan mode¶

Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables the fan silent mode.

USB charge¶

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.

LEDs¶

The are two LED devices supported by the driver:

Keyboard backlight¶

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.