diff --git a/daemon/actions/dpms/powerdevildpmsaction.cpp b/daemon/actions/dpms/powerdevildpmsaction.cpp
--- a/daemon/actions/dpms/powerdevildpmsaction.cpp
+++ b/daemon/actions/dpms/powerdevildpmsaction.cpp
@@ -96,15 +96,15 @@
 
 void PowerDevilDPMSAction::onProfileUnload()
 {
-    if (m_helper.isNull()) {
+    if (!isSupported()) {
         return;
     }
     m_helper->profileUnloaded();
 }
 
 void PowerDevilDPMSAction::onWakeupFromIdle()
 {
-    if (!m_helper.isNull()) {
+    if (isSupported()) {
         m_helper->stopFade();
     }
     if (m_oldKeyboardBrightness > 0) {
@@ -121,16 +121,16 @@
     }
 
     if (msec == m_idleTime * 1000 - 5000) { // fade out screen
-        if (!m_helper.isNull()) {
+        if (isSupported()) {
             m_helper->startFade();
         }
     } else if (msec == m_idleTime * 1000) {
         const int brightness = backend()->brightness(PowerDevil::BackendInterface::Keyboard);
         if (brightness > 0) {
             m_oldKeyboardBrightness = brightness;
             setKeyboardBrightnessHelper(0);
         }
-        if (!m_helper.isNull()) {
+        if (isSupported()) {
             m_helper->dpmsTimeout();
         }
     }
@@ -145,7 +145,7 @@
 
 void PowerDevilDPMSAction::onProfileLoad()
 {
-    if (m_helper.isNull()) {
+    if (!isSupported()) {
         return;
     }
     m_helper->profileLoaded(m_idleTime);
@@ -159,7 +159,7 @@
         return;
     }
 
-    if (m_helper.isNull()) {
+    if (!isSupported()) {
         return;
     }
     m_helper->trigger(args.value(QStringLiteral("Type")).toString());
@@ -193,7 +193,7 @@
 
     if (m_inhibitScreen) {
         // Inhibition triggered: disable DPMS
-        if (!m_helper.isNull()) {
+        if (isSupported()) {
             m_helper->inhibited();
         }
     } else {