Documentation/ABI/testing/sysfs-platform-dell-laptop

   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.rohar@gmail.com>
   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.rohar@gmail.com>
  17 Description:
  18                 This file allows to specifiy 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.rohar@gmail.com>
  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                     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
  44 What:           /sys/class/leds/dell::kbd_backlight/stop_timeout
  45 Date:           December 2014
  46 KernelVersion:  3.19
  47 Contact:        Gabriele Mazzotta <gabriele.mzt@gmail.com>,
  48                 Pali Rohár <pali.rohar@gmail.com>
  49 Description:
  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.