dpms(4) [freebsd man page]
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
Check Out this Related Man Page
DPMSForceLevel(3) X FUNCTIONS DPMSForceLevel(3) NAME
DPMSForceLevel - forces a DPMS capable display into the specified power level SYNOPSIS
cc [ flag ... ] file ... -lXext [ library ... ] #include <X11/extensions/dpms.h> Status DPMSForceLevel ( Display *display, CARD16 level ); ARGUMENTS
display Specifies the connection to the X server level Specifies the level to force power to DESCRIPTION
The DPMSForceLevel function forces a DPMS capable display into the specified power level. The level must be one of following four states: DPMSModeOn, DPMSModeStandby, DPMSModeSuspend, or DPMSModeOff. Values other than these will result in a BadValue error. If DPMS is disabled on the display, trying to set the power level on the display will result in a BadMatch protocol error. RETURN VALUES
TRUE The DPMSForceLevel function always returns TRUE. ERRORS
BadValue A level other than DPMSModeOn, DPMSModeStandby, DPMSModeSuspend, or DPMSModeOff was specified. BadMatch DPMS is disabled on the specified display. SEE ALSO
DPMSCapable(3), DPMSInfo(3), DPMSGetTimeouts(3), DPMSSetTimeouts(3) X Version 11 libXext 1.3.1 DPMSForceLevel(3)