freebsd man page for dpms

DPMS(4) 						   BSD Kernel Interfaces Manual 						   DPMS(4)

NAME
     dpms -- VESA BIOS DPMS driver

SYNOPSIS
     device dpms

DESCRIPTION
     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.

SEE ALSO
     acpi_video(4)

BUGS
     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.

BSD
								  August 23, 2008							       BSD