commit - 784ff9a710309b990c770398d04804cca3488986
commit + 21b2f17707ec9adbf894d788875deb9b12f86563
blob - b1704fa7b09d192d8c43f58d074b11e6112b3be3
blob + 620b41937d24c48796a0c6a4ef14b188cd41a952
--- slock/config.h
+++ slock/config.h
@@ -11,6 +11,9 @@ static const char *colorname[NUMCOLS] = {
 /* treat a cleared input like a wrong password (color) */
 static const int failonclear = 1;
 
+/* time in seconds before monitor shuts down */
+static const int monitortime = 3;
+
 /* allow control key to trigger fail on clear */
 static const int controlkeyclear = 0;
 
blob - 6f285abb0082a1e10b79990cecc07fd42b7472cc
blob + f8148ac3ee2553004f8efa4165f5c037b1aaad6c
--- slock/slock.c
+++ slock/slock.c
@@ -15,6 +15,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <X11/extensions/Xrandr.h>
+#include <X11/extensions/dpms.h>
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ -351,6 +352,7 @@ main(int argc, char **argv) {
 #endif
 	Display *dpy;
 	int s, nlocks, nscreens;
+	CARD16 standby, suspend, off;
 
 	ARGBEGIN {
 	case 'v':
@@ -421,6 +423,21 @@ main(int argc, char **argv) {
 	if (nlocks != nscreens)
 		return 1;
 
+	/* DPMS magic to disable the monitor */
+	if (!DPMSCapable(dpy))
+		die("slock: DPMSCapable failed\n");
+	if (!DPMSEnable(dpy))
+		die("slock: DPMSEnable failed\n");
+	if (!DPMSGetTimeouts(dpy, &standby, &suspend, &off))
+		die("slock: DPMSGetTimeouts failed\n");
+	if (!standby || !suspend || !off)
+		die("slock: at least one DPMS variable is zero\n");
+	if (!DPMSSetTimeouts(dpy, monitortime, monitortime, monitortime))
+		die("slock: DPMSSetTimeouts failed\n");
+	
+	XSync(dpy, 0);
+
+
 	/* run post-lock command */
 	if (argc > 0) {
 		switch (fork()) {
@@ -446,5 +463,9 @@ main(int argc, char **argv) {
 	readpw(dpy, &rr, locks, nscreens, hash);
 #endif
 
+	/* reset DPMS values to inital ones */
+	DPMSSetTimeouts(dpy, standby, suspend, off);
+	XSync(dpy, 0);
+
 	return 0;
 }