tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1.. SPDX-License-Identifier: GPL-2.0+
2LG Gram laptop extra features
3=============================
4
5By Matan Ziv-Av <matan@svgalib.org>
6
7
8Hotkeys
9-------
10
11The following FN keys are ignored by the kernel without this driver:
12- FN-F1 (LG control panel) - Generates F15
13- FN-F5 (Touchpad toggle) - Generates F13
14- FN-F6 (Airplane mode) - Generates RFKILL
15- FN-F8 (Keyboard backlight) - Generates F16.
16 This key also changes keyboard backlight mode.
17- FN-F9 (Reader mode) - Generates F14
18
19The rest of the FN key work without a need for a special driver.
20
21
22Reader mode
23-----------
24
25Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables
26reader mode. In this mode the screen colors change (blue color reduced),
27and the reader mode indicator LED (on F9 key) turns on.
28
29
30FN Lock
31-------
32
33Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables
34FN lock.
35
36
37Battery care limit
38------------------
39
40Writing 80/100 to /sys/devices/platform/lg-laptop/battery_care_limit
41sets the maximum capacity to charge the battery. Limiting the charge
42reduces battery capacity loss over time.
43
44This value is reset to 100 when the kernel boots.
45
46
47Fan mode
48--------
49
50Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables
51the fan silent mode.
52
53
54USB charge
55----------
56
57Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables
58charging another device from the USB port while the device is turned off.
59
60This value is reset to 0 when the kernel boots.
61
62
63LEDs
64~~~~
65
66The are two LED devices supported by the driver:
67
68Keyboard backlight
69------------------
70
71A led device named kbd_led controls the keyboard backlight. There are three
72lighting level: off (0), low (127) and high (255).
73
74The keyboard backlight is also controlled by the key combination FN-F8
75which cycles through those levels.
76
77
78Touchpad indicator LED
79----------------------
80
81On the F5 key. Controlled by led device names tpad_led.