total 0
drwxr-xr-x 3 root root    0 Aug 19 15:06 .
drwxr-xr-x 4 root root    0 Aug 19 15:06 ..
-r--r--r-- 1 root root 4096 Aug 19 15:21 actual_brightness
-rw-r--r-- 1 root root 4096 Aug 19 15:21 bl_power
-rw-r--r-- 1 root root 4096 Aug 19 15:21 brightness
lrwxrwxrwx 1 root root    0 Aug 19 15:21 device -> ../../card0-LVDS-1
-r--r--r-- 1 root root 4096 Aug 19 15:21 max_brightness
drwxr-xr-x 2 root root    0 Aug 19 15:21 power
lrwxrwxrwx 1 root root    0 Aug 19 15:06 subsystem -> ../../../../../../../class/backlight
-r--r--r-- 1 root root 4096 Aug 19 15:06 type
-rw-r--r-- 1 root root 4096 Aug 19 15:06 uevent