I have a Thinkpad 470 and I am running Ubuntu 16.04 LTS on it. I don't like to keep the keyboard backlight on during daytime because I want to save battery among other things. What I have noticed is that the backlight turns itself on even if it is woken up from a state where the screen was dimmed completely or system had gone to sleep due to inactivity. The issue is that in day time or in presence of bright lights I am unable to see the backlight is on, thus I don't switch it off and this drains the battery. I want to be able to control this setting. How do I do this?
After searching a bit in the following location :
I found the following files:
rgh@arrakis:/sys/class/leds/tpacpi::kbd_backlight$ ls brightness brightness_hw_changed device max_brightness power subsystem trigger uevent
From among these, the file trigger contains the following items inside:
[none] rfkill-any kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock AC-online BAT0-charging-or-full BAT0-charging BAT0-full BAT0-charging-blink-full-solid BAT1-charging-or-full BAT1-charging BAT1-full BAT1-charging-blink-full-solid usb-gadget usb-host disk-activity ide-disk mtd nand-disk cpu cpu0 cpu1 cpu2 cpu3 panic bluetooth-power rfkill0 rfkill1 phy0rx phy0tx phy0assoc phy0radio hci0-power rfkill41
I am guessing something here needs to be removed to get the behaviour I am looking for? Can you please tell me if I am correct? How to get this done?