1.. SPDX-License-Identifier: GPL-2.0+ 2 3 4LG Gram laptop extra features 5============================= 6 7By Matan Ziv-Av <matan@svgalib.org> 8 9 10Hotkeys 11------- 12 13The following FN keys are ignored by the kernel without this driver: 14 15- FN-F1 (LG control panel) - Generates F15 16- FN-F5 (Touchpad toggle) - Generates F21 17- FN-F6 (Airplane mode) - Generates RFKILL 18- FN-F9 (Reader mode) - Generates F14 19 20The rest of the FN keys work without a need for a special driver. 21 22 23Reader mode 24----------- 25 26Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables 27reader mode. In this mode the screen colors change (blue color reduced), 28and the reader mode indicator LED (on F9 key) turns on. 29 30 31FN Lock 32------- 33 34Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables 35FN lock. 36 37 38Battery care limit 39------------------ 40 41Writing 80/100 to /sys/class/power_supply/CMB0/charge_control_end_threshold 42sets the maximum capacity to charge the battery. Limiting the charge 43reduces battery capacity loss over time. 44 45This value is reset to 100 when the kernel boots. 46 47 48Fan mode 49-------- 50 51Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables 52the fan silent mode. 53 54 55USB charge 56---------- 57 58Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables 59charging another device from the USB port while the device is turned off. 60 61This value is reset to 0 when the kernel boots. 62 63 64LEDs 65~~~~ 66 67The are two LED devices supported by the driver: 68 69Keyboard backlight 70------------------ 71 72A led device named kbd_led controls the keyboard backlight. There are three 73lighting level: off (0), low (127) and high (255). 74 75The keyboard backlight is also controlled by the key combination FN-F8 76which cycles through those levels. 77 78 79Touchpad indicator LED 80---------------------- 81 82On the F5 key. Controlled by led device names tpad_led. 83