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