I have a Samsung Notebook 7 spin 15.6" FHD Touch NP740U5L-Y02US - i7-6500U - 12GB - 1TB set up dual boot Windows 10 and Ubuntu 16.04.
Function Key + F9 is supposed to control keyboard backlight, but it does not do anything. The keyboard backlight is always on. I know that Ubuntu can control the backlight because when I shine a flashlight directly on the sensor, the backglight turns off. However when I remove the flashlight the backlight goes on again.
How can I manually control the backlight (either by the function key or other way)?
Thing's I've looked at:
I have looked at my
/sys/classfolder and in there I see a folder called
backlightwhich has settings for the screen brightness, and a folder called
ledswhich has settings indicator lights for things like caps lock. I thought the keyboard light settings might be in the
ledsfolder but I don't see that there. Like I said, I know Ubuntu can control my keyboard light via the light sensor but I need to control it manually.
I have also tried
xset ledcycling through numbers 1-32. I have also tried editing the
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"line in
/etc/default/gruball with no success.
I have tried installing the samsung tools package (https://answers.launchpad.net/samsung-tools/+question/289901) but using that I get the message
Backlight cannot be disabled
/etc/acpiand the script includes reference to
KEYS_DIR=/sys/class/leds/asus\:\:kbd_backlightbut that file does not exist.
If I run
Fn-F9(that's supposed to be mapped to keyboard light) nothing happens. If I shine a light on the sensor, the keyboard light turns off but there is no output while running