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