added TVout DPMS function: at this time only completely disables output when non-TVout mode is selected.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14391 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/accelerants/nvidia/engine/nv_brooktreetv.c

@@ -1211,6 +1211,48 @@ static uint8 BT_read_monstat(uint8* monstat)
 	return stat;
 }//end BT_read_monstat.
 
+static uint8 BT_dpms(bool display)
+{
+	uint8 stat;
+
+	uint8 buffer[3];
+
+	LOG(4,("Brooktree: setting DPMS: "));
+
+	/* reset status */
+	i2c_flag_error (-1);
+
+	/* shutdown all analog electronics... */
+	buffer[0] = si->ps.tv_encoder.adress + WR;
+	/* select first TV config register to write */
+	buffer[1] = 0xba;
+	if (display)
+	{
+		/* enable all DACs */
+		buffer[2] = 0x00;
+		LOG(4,("display on\n"));
+	}
+	else
+	{
+		/* shutdown all DACs */
+		buffer[2] = 0x10;
+		LOG(4,("display off\n"));
+	}
+
+	i2c_bstart(si->ps.tv_encoder.bus);
+	i2c_writebuffer(si->ps.tv_encoder.bus, buffer, 3);
+	i2c_bstop(si->ps.tv_encoder.bus);
+	/* log on errors */
+	stat = i2c_flag_error(0);
+	if (stat)
+	{
+		LOG(4,("Brooktree: I2C errors occurred while setting DPMS\n"));
+		return stat;
+	}
+
+	return stat;
+}//end BT_dpms.
+
 static uint8 BT_killclk_blackout(void)
 {
 	uint8 stat;
@@ -1291,6 +1333,9 @@ static uint8 BT_killclk_blackout(void)
 		return stat;
 	}
 
+	/* shutdown all analog electronics */
+	stat = BT_dpms(false);
+
 	return stat;
 }//end BT_killclk_blackout.