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- .. SPDX-License-Identifier: GPL-2.0+
- LG Gram laptop extra features
- =============================
- By Matan Ziv-Av <matan@svgalib.org>
- 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 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.
- 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/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.
- Fan mode
- --------
- Writing 0/1/2 to /sys/devices/platform/lg-laptop/fan_mode sets fan mode to
- Optimal/Silent/Performance respectively.
- 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.
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