Comment 133 for bug 971061

I am not quite sure that the keyboard backlight sensor is independent from this bug. In my case (without UEFI) the sensor does not work when the the laptop cannot detect the AC plugged status. After the fix (or after resetting the battery) the sensor works correctly (the keyboard gets illuminated when the ambient is dark). Manually inserting 0 or 8 in /sys/devices/platform/samsung/leds/samsung::kbd_backlight/brightness on the other hand always works.