dpms —
VESA BIOS
DPMS driver
device dpms
The
dpms driver uses the VESA BIOS to manage an
external display during suspend and resume. When the machine suspends, the
dpms driver turns the external display off. When
the machine resumes, it restores the display to its state when the driver was
first loaded.
acpi_video(4)
The VESA BIOS DPMS calls do not provide any way to identify a particular display
or adapter to manipulate. As a result, this driver may have unexpected results
on systems with multiple displays and/or adapters.