diff -up synergy-1.3.1/lib/platform/CXWindowsScreen.cpp.dpms synergy-1.3.1/lib/platform/CXWindowsScreen.cpp
--- synergy-1.3.1/lib/platform/CXWindowsScreen.cpp.dpms	2008-06-02 19:32:47.000000000 +0200
+++ synergy-1.3.1/lib/platform/CXWindowsScreen.cpp	2008-06-02 19:39:32.000000000 +0200
@@ -36,6 +36,9 @@
 #	define XK_MISCELLANY
 #	define XK_XKB_KEYS
 #	include <X11/keysymdef.h>
+	extern "C" {
+#	include <X11/extensions/dpms.h>
+	}
 #	if HAVE_X11_EXTENSIONS_XTEST_H
 #		include <X11/extensions/XTest.h>
 #	else
@@ -230,6 +233,19 @@ CXWindowsScreen::enter()
 		XSetInputFocus(m_display, m_lastFocus, m_lastFocusRevert, CurrentTime);
 	}
 
+	// Force the DPMS to turn screen back on since we don't
+	// actually cause physical hardware input to trigger it
+	int dummy;
+	CARD16 powerlevel;
+	BOOL enabled;
+	if (DPMSQueryExtension(m_display, &dummy, &dummy) &&
+	    DPMSCapable(m_display) &&
+	    DPMSInfo(m_display, &powerlevel, &enabled))
+	{
+		if (enabled && powerlevel != DPMSModeOn)
+			DPMSForceLevel(m_display, DPMSModeOn);
+	}
+
 	// unmap the hider/grab window.  this also ungrabs the mouse and
 	// keyboard if they're grabbed.
 	XUnmapWindow(m_display, m_window);