ls /sys/devices/platform/hp_accel/ # Check presence cat /sys/devices/platform/hp_accel/position # Read XYZ accelerometer data cat /sys/devices/platform/hp_accel/freefall # Test event trigger
Understanding ACPI\SMO8800: The Dell Free Fall Data Protection Sensor acpi smo8800
If you see ACPI\VEN_SMO&DEV_8800 or ACPI\SMO8800 , you have found the Free Fall Sensor. How to Download and Install the ACPI\SMO8800 Driver The system then "parks" the heads of the
Its primary job is to detect sudden motion. If the sensor perceives that the laptop is in a state of "free fall"—meaning it has been dropped or is falling off a desk—it sends an immediate signal to the system. The system then "parks" the heads of the mechanical hard disk drive (HDD). By moving the read/write heads away from the spinning platters, it prevents a "head crash," which could otherwise cause permanent data loss or physical damage to the drive. Do You Need This Driver? it prevents a "head crash