Legacy Document

Inside Macintosh: Devices /

Chapter 6 - Power Manager / Power Manager Reference

Power Manager Dispatch Routines / Controlling the Dimming Timer

SetDimmingTimeout

You can use the SetDimmingTimeout function to set how long the computer will wait before dimming the screen.

void SetDimmingTimeout(unsigned char timeout);

timeout

The amount of time that the computer will wait after the last user activity before dimming the screen expressed as a number of 15-second intervals. Specify 0 to cause the screen to dim immediately.

DESCRIPTION

The SetDimmingTimeout function sets the amount of time the computer will wait after the last user activity before dimming the screen. The value of SetDimmingTimeout is expressed as the number of 15-second intervals making up the desired time.

ASSEMBLY-LANGUAGE INFORMATION

The trap is _PowerMgrDispatch ($A09E). The selector value for SetDimmingTimeout is 30 ($1E) in the low word of register D0. The dimming timeout value to set is passed in the high word of register D0.

SEE ALSO

You can use the PMFeatures function (page 6-41) to determine whether the computer supports automatic dimming.