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CentOS 7.0 - man page for dpmsforcelevel (centos section 3)

DPMSForceLevel(3)						    X FUNCTIONS 						 DPMSForceLevel(3)

DPMSForceLevel - forces a DPMS capable display into the specified power level
cc [ flag ... ] file ... -lXext [ library ... ] #include <X11/extensions/dpms.h> Status DPMSForceLevel ( Display *display, CARD16 level );
display Specifies the connection to the X server level Specifies the level to force power to
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.
TRUE The DPMSForceLevel function always returns TRUE.
BadValue A level other than DPMSModeOn, DPMSModeStandby, DPMSModeSuspend, or DPMSModeOff was specified. BadMatch DPMS is disabled on the specified display.
DPMSCapable(3), DPMSInfo(3), DPMSGetTimeouts(3), DPMSSetTimeouts(3) X Version 11 libXext 1.3.2 DPMSForceLevel(3)
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