The _ADR device path is used to contain video output device attributes to support the Graphics Output Protocol. The device path can contain multiple _ADR entries if multiple video output devices are displaying the same output.
ADR value. For video output devices the value of this field comes from Table B-2 of the ACPI 3.0 specification. At least one ADR value is required.
See Implementation
The _ADR device path is used to contain video output device attributes to support the Graphics Output Protocol. The device path can contain multiple _ADR entries if multiple video output devices are displaying the same output.