24.15. Video adapter and display entries
/proc/acpi/video/VID/*/state
The value for state also comes straight from the ACPI specs:
bits 5-31 are zero, and the meaningful bits are as follows:
bit 4 [optional]: set if device is attached,
bit 3: set if device is not defective,
bit 2: set if output is ready to switch,
bit 1: output is activated,
bit 0: output connector exists now
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