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