0001 What: /sys/class/leds/dell::kbd_backlight/als_enabled
0002 Date: December 2014
0003 KernelVersion: 3.19
0004 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
0005 Pali Rohár <pali@kernel.org>
0006 Description:
0007 This file allows to control the automatic keyboard
0008 illumination mode on some systems that have an ambient
0009 light sensor. Write 1 to this file to enable the auto
0010 mode, 0 to disable it.
0011
0012 What: /sys/class/leds/dell::kbd_backlight/als_setting
0013 Date: December 2014
0014 KernelVersion: 3.19
0015 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
0016 Pali Rohár <pali@kernel.org>
0017 Description:
0018 This file allows to specifiy the on/off threshold value,
0019 as reported by the ambient light sensor.
0020
0021 What: /sys/class/leds/dell::kbd_backlight/start_triggers
0022 Date: December 2014
0023 KernelVersion: 3.19
0024 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
0025 Pali Rohár <pali@kernel.org>
0026 Description:
0027 This file allows to control the input triggers that
0028 turn on the keyboard backlight illumination that is
0029 disabled because of inactivity.
0030 Read the file to see the triggers available. The ones
0031 enabled are preceded by '+', those disabled by '-'.
0032
0033 To enable a trigger, write its name preceded by '+' to
0034 this file. To disable a trigger, write its name preceded
0035 by '-' instead.
0036
0037 For example, to enable the keyboard as trigger run::
0038
0039 echo +keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers
0040
0041 To disable it::
0042
0043 echo -keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers
0044
0045 Note that not all the available triggers can be configured.
0046
0047 What: /sys/class/leds/dell::kbd_backlight/stop_timeout
0048 Date: December 2014
0049 KernelVersion: 3.19
0050 Contact: Gabriele Mazzotta <gabriele.mzt@gmail.com>,
0051 Pali Rohár <pali@kernel.org>
0052 Description:
0053 This file allows to specify the interval after which the
0054 keyboard illumination is disabled because of inactivity.
0055 The timeouts are expressed in seconds, minutes, hours and
0056 days, for which the symbols are 's', 'm', 'h' and 'd'
0057 respectively.
0058
0059 To configure the timeout, write to this file a value along
0060 with any the above units. If no unit is specified, the value
0061 is assumed to be expressed in seconds.
0062
0063 For example, to set the timeout to 10 minutes run::
0064
0065 echo 10m > /sys/class/leds/dell::kbd_backlight/stop_timeout
0066
0067 Note that when this file is read, the returned value might be
0068 expressed in a different unit than the one used when the timeout
0069 was set.
0070
0071 Also note that only some timeouts are supported and that
0072 some systems might fall back to a specific timeout in case
0073 an invalid timeout is written to this file.
