1 What: /sys/class/leds/dell::kbd_back 1 What: /sys/class/leds/dell::kbd_backlight/als_enabled
2 Date: December 2014 2 Date: December 2014
3 KernelVersion: 3.19 3 KernelVersion: 3.19
4 Contact: Gabriele Mazzotta <gabriele.mzt 4 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
5 Pali Rohár <pali@kernel.org> 5 Pali Rohár <pali@kernel.org>
6 Description: 6 Description:
7 This file allows to control th 7 This file allows to control the automatic keyboard
8 illumination mode on some syst 8 illumination mode on some systems that have an ambient
9 light sensor. Write 1 to this 9 light sensor. Write 1 to this file to enable the auto
10 mode, 0 to disable it. 10 mode, 0 to disable it.
11 11
12 What: /sys/class/leds/dell::kbd_back 12 What: /sys/class/leds/dell::kbd_backlight/als_setting
13 Date: December 2014 13 Date: December 2014
14 KernelVersion: 3.19 14 KernelVersion: 3.19
15 Contact: Gabriele Mazzotta <gabriele.mzt 15 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
16 Pali Rohár <pali@kernel.org> 16 Pali Rohár <pali@kernel.org>
17 Description: 17 Description:
18 This file allows to specify th 18 This file allows to specify the on/off threshold value,
19 as reported by the ambient lig 19 as reported by the ambient light sensor.
20 20
21 What: /sys/class/leds/dell::kbd_back 21 What: /sys/class/leds/dell::kbd_backlight/start_triggers
22 Date: December 2014 22 Date: December 2014
23 KernelVersion: 3.19 23 KernelVersion: 3.19
24 Contact: Gabriele Mazzotta <gabriele.mzt 24 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
25 Pali Rohár <pali@kernel.org> 25 Pali Rohár <pali@kernel.org>
26 Description: 26 Description:
27 This file allows to control th 27 This file allows to control the input triggers that
28 turn on the keyboard backlight 28 turn on the keyboard backlight illumination that is
29 disabled because of inactivity 29 disabled because of inactivity.
30 Read the file to see the trigg 30 Read the file to see the triggers available. The ones
31 enabled are preceded by '+', t 31 enabled are preceded by '+', those disabled by '-'.
32 32
33 To enable a trigger, write its 33 To enable a trigger, write its name preceded by '+' to
34 this file. To disable a trigge 34 this file. To disable a trigger, write its name preceded
35 by '-' instead. 35 by '-' instead.
36 36
37 For example, to enable the key 37 For example, to enable the keyboard as trigger run::
38 38
39 echo +keyboard > /sys/clas 39 echo +keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers
40 40
41 To disable it:: 41 To disable it::
42 42
43 echo -keyboard > /sys/clas 43 echo -keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers
44 44
45 Note that not all the availabl 45 Note that not all the available triggers can be configured.
46 46
47 What: /sys/class/leds/dell::kbd_back 47 What: /sys/class/leds/dell::kbd_backlight/stop_timeout
48 Date: December 2014 48 Date: December 2014
49 KernelVersion: 3.19 49 KernelVersion: 3.19
50 Contact: Gabriele Mazzotta <gabriele.mzt 50 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
51 Pali Rohár <pali@kernel.org> 51 Pali Rohár <pali@kernel.org>
52 Description: 52 Description:
53 This file allows to specify th 53 This file allows to specify the interval after which the
54 keyboard illumination is disab 54 keyboard illumination is disabled because of inactivity.
55 The timeouts are expressed in 55 The timeouts are expressed in seconds, minutes, hours and
56 days, for which the symbols ar 56 days, for which the symbols are 's', 'm', 'h' and 'd'
57 respectively. 57 respectively.
58 58
59 To configure the timeout, writ 59 To configure the timeout, write to this file a value along
60 with any the above units. If n 60 with any the above units. If no unit is specified, the value
61 is assumed to be expressed in 61 is assumed to be expressed in seconds.
62 62
63 For example, to set the timeou 63 For example, to set the timeout to 10 minutes run::
64 64
65 echo 10m > /sys/class/leds 65 echo 10m > /sys/class/leds/dell::kbd_backlight/stop_timeout
66 66
67 Note that when this file is re 67 Note that when this file is read, the returned value might be
68 expressed in a different unit 68 expressed in a different unit than the one used when the timeout
69 was set. 69 was set.
70 70
71 Also note that only some timeo 71 Also note that only some timeouts are supported and that
72 some systems might fall back t 72 some systems might fall back to a specific timeout in case
73 an invalid timeout is written 73 an invalid timeout is written to this file.
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