diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index 1126967..f64572e 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -1909,8 +1909,17 @@ int ATBDeviceControllerPlugin::init_sc_dbus()
 
 void ATBDeviceControllerPlugin::onWokeUp(uchar source)
 {
-    if (source == 0x01 || source == 0xFE) {
-        // woke up from device controller
+    /* PTU5 wakeup sources:
+     *    0x01 - on wakeup from DeviceController
+     *    0x02 - on wakeup from WakeupButton
+     *    0x03 - on wakeup from ResetKey
+     *    0x04 - on wakeup from rtc
+     *    0xFE - signal emitted by timer (on mains powered machines)
+     *    0xFF - unknown wakeup source
+     */
+
+    if (source == 0x01 || source == 0x03 || source == 0xFE) {
+        // woke up from device controller, rtc or timer
         hw->dc_autoRequest(true);
         this->diag->diagRequest();
     }