Document how the mount-matrix for the base-accelerometer must be set on 360 degree hinges style 2-in-1s with 2 sensors (one in the display and 1 in the base). Note the choice to define the lid being fully closed as an angle of 0 degrees is based on the ACPI tables of devices with a BOSC0200 ACPI device-node describing both sensors. In this case the ACPI tables contain mount-matrix info (and the kernel will soon support reading this and exporting it to userspace) and the mount-matrices defined in these ACPI tables are such that the angle of the G-force vector measured by the sensors is identical for both sensors when the laptop's lid is fully closed. This also feels more natural then defining the laptop being fully open (180 degrees open) as the home / 0 degree angle position.
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