diff --git a/amdgpu_fan/controller.py b/amdgpu_fan/controller.py
index d831880..326db24 100644
--- a/amdgpu_fan/controller.py
+++ b/amdgpu_fan/controller.py
@@ -32,6 +32,9 @@ def main(self):
         try:
             self._main_loop()
         except KeyboardInterrupt:
+            for name, card in self._scanner.cards.items():
+                logger.debug(f"Setting {name} fan back to kernel controlled.")
+                card.set_system_controlled_fan(True)
             logger.info(f'Exiting.')
 
     def _main_loop(self):
diff --git a/amdgpu_fan/lib/amdgpu.py b/amdgpu_fan/lib/amdgpu.py
index d226ad0..fa77b49 100644
--- a/amdgpu_fan/lib/amdgpu.py
+++ b/amdgpu_fan/lib/amdgpu.py
@@ -70,7 +70,7 @@ def fan_min(self):
         return int(self.read_endpoint('pwm1_min'))
 
     def set_system_controlled_fan(self, state):
-        self.write_endpoint('pwm1_enable', 0 if state else 1)
+        self.write_endpoint('pwm1_enable', 2 if state else 1)
 
     def set_fan_speed(self, speed):
         if speed >= 100: