# find /sys/devices/virtual/backlight/ -type f -exec echo -n "{}: " \; -exec cat "{}" \;
/sys/devices/virtual/backlight/apple_backlight/uevent: 
/sys/devices/virtual/backlight/apple_backlight/bl_power: 1
/sys/devices/virtual/backlight/apple_backlight/brightness: 0
/sys/devices/virtual/backlight/apple_backlight/actual_brightness: 0
/sys/devices/virtual/backlight/apple_backlight/max_brightness: 15
/sys/devices/virtual/backlight/apple_backlight/type: platform
/sys/devices/virtual/backlight/apple_backlight/power/async: disabled
/sys/devices/virtual/backlight/apple_backlight/power/runtime_status: unsupported
/sys/devices/virtual/backlight/apple_backlight/power/runtime_usage: 0
/sys/devices/virtual/backlight/apple_backlight/power/runtime_active_kids: 0
/sys/devices/virtual/backlight/apple_backlight/power/runtime_enabled: disabled
/sys/devices/virtual/backlight/apple_backlight/power/control: auto
/sys/devices/virtual/backlight/apple_backlight/power/runtime_suspended_time: 0
/sys/devices/virtual/backlight/apple_backlight/power/runtime_active_time: 0
/sys/devices/virtual/backlight/apple_backlight/power/autosuspend_delay_ms: cat: /sys/devices/virtual/backlight/apple_backlight/power/autosuspend_delay_ms: Input/output error