tree /sys/class/backlight/acpi_video0/

$ tree /sys/class/backlight/acpi_video0/
/sys/class/backlight/acpi_video0/
├── actual_brightness
├── bl_power
├── brightness
├── device -> ../../../0000:01:00.0
├── max_brightness
├── power
│   ├── async
│   ├── autosuspend_delay_ms
│   ├── control
│   ├── runtime_active_kids
│   ├── runtime_active_time
│   ├── runtime_enabled
│   ├── runtime_status
│   ├── runtime_suspended_time
│   └── runtime_usage
├── subsystem -> ../../../../../../class/backlight
├── type
└── uevent

3 directories, 15 files