Inside Macintosh: Devices /

Chapter 6 - Power Manager / Power Manager Reference

Power Manager Dispatch Routines / Controlling the Dimming Timer

GetDimmingTimeout

You can use the GetDimmingTimeout function to find out how long the computer will wait before dimming the screen.

unsigned char GetDimmingTimeout();

DESCRIPTION

The GetDimmingTimeout function returns the amount of time that the computer will wait after the last user activity before dimming the screen. The value of GetDimmingTimeout is expressed as the number of 15-second intervals that the computer will wait before dimming the screen.

ASSEMBLY-LANGUAGE INFORMATION

The trap is _PowerMgrDispatch ($A09E). The selector value for GetDimmingTimeout is 29 ($1D) in the low word of register D0. The dimming timeout value is returned in the low word of register D0.