total 0
-r--r--r-- 1 root root 4096 Sep 28 18:23 actual_brightness
-rw-r--r-- 1 root root 4096 Sep 28 18:22 bl_power
-rw-r--r-- 1 root root 4096 Sep 28 18:22 brightness
lrwxrwxrwx 1 root root    0 Sep 28 18:23 device -> ../../card0-LVDS-1
-r--r--r-- 1 root root 4096 Sep 28 18:22 max_brightness
drwxr-xr-x 2 root root    0 Sep 28 18:23 power
lrwxrwxrwx 1 root root    0 Sep 28 18:23 subsystem -> ../../../../../../../class/backlight
-r--r--r-- 1 root root 4096 Sep 28 18:22 type
-rw-r--r-- 1 root root 4096 Sep 28 18:20 uevent