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/class
folder and in there I see a folder calledbacklight
which has settings for the screen brightness, and a folder calledleds
which has settings indicator lights for things like caps lock. I thought the keyboard light settings might be in theleds
folder 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 led
cycling through numbers 1-32. I have also tried editing theGRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
line in/etc/default/grub
all 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
asus-keyboard-backlight.sh
exists in/etc/acpi
and the script includes reference toKEYS_DIR=/sys/class/leds/asus\:\:kbd_backlight
but that file does not exist.If I run
acpi_listen
and hitFn-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 runningacpi_listen
acpi_osi=Linux
to the command line arguments? Do things start to work? Alternatively, please tryacpi_osi=Windows
.