Disable polling of triggerless devices by default

This resolves Bug 1516

tdecore/tdehardwaredevices.cpp

@@ -2326,17 +2326,12 @@ TDEHardwareDevices::TDEHardwareDevices() {
 #else
 		m_cpuWatchTimer = new TQTimer(this);
 		connect( m_cpuWatchTimer, SIGNAL(timeout()), this, SLOT(processModifiedCPUs()) );
-		TQDir nodezerocpufreq("/sys/devices/system/cpu/cpu0/cpufreq");
-		if (nodezerocpufreq.exists()) {
-			m_cpuWatchTimer->start( 500, FALSE ); // 0.5 second repeating timer
-		}
 #endif
 
 		// Some devices do not receive update signals from udev
 		// These devices must be polled, and a good polling interval is 1 second
 		m_deviceWatchTimer = new TQTimer(this);
 		connect( m_deviceWatchTimer, SIGNAL(timeout()), this, SLOT(processStatelessDevices()) );
-		m_deviceWatchTimer->start( 1000, FALSE ); // 1 second repeating timer
 
 		// Update internal device information
 		queryHardwareInformation();
@@ -2376,6 +2371,20 @@ TDEHardwareDevices::~TDEHardwareDevices() {
 	}
 }
 
+void TDEHardwareDevices::setTriggerlessHardwareUpdatesEnabled(bool enable) {
+	if (enable) {
+		TQDir nodezerocpufreq("/sys/devices/system/cpu/cpu0/cpufreq");
+		if (nodezerocpufreq.exists()) {
+			m_cpuWatchTimer->start( 500, FALSE ); // 0.5 second repeating timer
+		}
+		m_deviceWatchTimer->start( 1000, FALSE ); // 1 second repeating timer
+	}
+	else {
+		m_cpuWatchTimer->stop();
+		m_deviceWatchTimer->stop();
+	}
+}
+
 void TDEHardwareDevices::rescanDeviceInformation(TDEGenericDevice* hwdevice) {
 	struct udev_device *dev;
 	dev = udev_device_new_from_syspath(m_udevStruct, hwdevice->systemPath().ascii());

tdecore/tdehardwaredevices.h

@@ -2023,6 +2023,15 @@ class TDECORE_EXPORT TDEHardwareDevices : public TQObject
 		*/
 		void rescanDeviceInformation(TDEGenericDevice* hwdevice);
 
+		/**
+		*  Enable or disable automatic state updates of triggerless hardware devices
+		*  such as CPUs and network cards.  When enabled, your application will use
+		*  additional CPU resources to continually poll triggerless hardware devices.
+		*  Automatic updates are disabled by default.
+		*  @param enable a bool specifiying whether or not automatic updates should be enabled
+		*/
+		void setTriggerlessHardwareUpdatesEnabled(bool enable);
+
 		/**
 		*  Convert a byte count to human readable form
 		*  @param bytes a double containing the number of bytes