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1What: /sys/class/leds/dell::kbd_backlight/als_enabled2Date: December 20143KernelVersion: 3.194Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,5 Pali Rohár <pali@kernel.org>6Description:7 This file allows to control the automatic keyboard8 illumination mode on some systems that have an ambient9 light sensor. Write 1 to this file to enable the auto10 mode, 0 to disable it.11 12What: /sys/class/leds/dell::kbd_backlight/als_setting13Date: December 201414KernelVersion: 3.1915Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,16 Pali Rohár <pali@kernel.org>17Description:18 This file allows to specify the on/off threshold value,19 as reported by the ambient light sensor.20 21What: /sys/class/leds/dell::kbd_backlight/start_triggers22Date: December 201423KernelVersion: 3.1924Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,25 Pali Rohár <pali@kernel.org>26Description:27 This file allows to control the input triggers that28 turn on the keyboard backlight illumination that is29 disabled because of inactivity.30 Read the file to see the triggers available. The ones31 enabled are preceded by '+', those disabled by '-'.32 33 To enable a trigger, write its name preceded by '+' to34 this file. To disable a trigger, write its name preceded35 by '-' instead.36 37 For example, to enable the keyboard as trigger run::38 39 echo +keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers40 41 To disable it::42 43 echo -keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers44 45 Note that not all the available triggers can be configured.46 47What: /sys/class/leds/dell::kbd_backlight/stop_timeout48Date: December 201449KernelVersion: 3.1950Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,51 Pali Rohár <pali@kernel.org>52Description:53 This file allows to specify the interval after which the54 keyboard illumination is disabled because of inactivity.55 The timeouts are expressed in seconds, minutes, hours and56 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 along60 with any the above units. If no unit is specified, the value61 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_timeout66 67 Note that when this file is read, the returned value might be68 expressed in a different unit than the one used when the timeout69 was set.70 71 Also note that only some timeouts are supported and that72 some systems might fall back to a specific timeout in case73 an invalid timeout is written to this file.74