From d810b10d98ed07f88807d85a1d1e6561d13d122e Mon Sep 17 00:00:00 2001
From: Kyzentun Keeslala <kyzentun@gmail.com>
Date: Tue, 5 Jan 2016 16:28:14 -0700
Subject: [PATCH] Added code to disable x11 dpms on startup and restore it on
 exit.

---
 src/archutils/Unix/X11Helper.cpp | 37 ++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/src/archutils/Unix/X11Helper.cpp b/src/archutils/Unix/X11Helper.cpp
index a7c4b30b16..78a315cad6 100644
--- a/src/archutils/Unix/X11Helper.cpp
+++ b/src/archutils/Unix/X11Helper.cpp
@@ -5,6 +5,8 @@
 #include "Preference.h"
 #include "PrefsManager.h" // XXX: only used for m_bShowMouseCursor -aj
 
+#include <X11/extensions/dpms.h>
+
 Display *X11Helper::Dpy = NULL;
 Window X11Helper::Win = None;
 
@@ -13,6 +15,9 @@ static int FatalCallback( Display* );
 
 static Preference<RString>		g_XWMName( "XWMName", PRODUCT_ID );
 
+static bool display_supports_dpms_extension= false;
+static bool dpms_state_at_startup= false;
+
 bool X11Helper::OpenXConnection()
 {
 	DEBUG_ASSERT( Dpy == NULL && Win == None );
@@ -22,11 +27,43 @@ bool X11Helper::OpenXConnection()
 
 	XSetIOErrorHandler( FatalCallback );
 	XSetErrorHandler( ErrorCallback );
+	int event_base, error_base;
+	display_supports_dpms_extension= DPMSQueryExtension(Dpy, &event_base, &error_base);
+	if(display_supports_dpms_extension)
+	{
+		LOG->Trace("DPMSQueryExtension returned true.  Stepmania will disable power management, and restore the original state on exit.");
+		CARD16 power_level;
+		BOOL state;
+		if(DPMSInfo(Dpy, &power_level, &state))
+		{
+			dpms_state_at_startup= state;
+			DPMSDisable(Dpy);
+		}
+		else
+		{
+			LOG->Trace("DPMSInfo returned false.  Stepmania will not be able to disable power management.");
+		}
+	}
+	else
+	{
+		LOG->Trace("DPMSQueryExtension returned false, which means this display does not support the DPMS extension.  Stepmania will not be able to disable power management.");
+	}
 	return true;
 }
 
 void X11Helper::CloseXConnection()
 {
+	if(display_supports_dpms_extension)
+	{
+		if(dpms_state_at_startup)
+		{
+			DPMSEnable(Dpy);
+		}
+		else
+		{
+			DPMSDisable(Dpy);
+		}
+	}
 	// The window should have been shut down
 	DEBUG_ASSERT( Dpy != NULL );
 	DEBUG_ASSERT( Win == None );