diff --git a/src/ppd-driver-platform-profile.c b/src/ppd-driver-platform-profile.c
index 8111251f3f507c0329d2a8be3eee73371bec7693..79820a3230e88c699e9dd16f83fa443c02df54b1 100644
--- a/src/ppd-driver-platform-profile.c
+++ b/src/ppd-driver-platform-profile.c
@@ -29,6 +29,9 @@ struct _PpdDriverPlatformProfile
   GFileMonitor *lapmode_mon;
   GFileMonitor *acpi_platform_profile_mon;
   guint acpi_platform_profile_changed_id;
+
+  gboolean can_taint;
+  gboolean tainted;
 };
 
 G_DEFINE_TYPE (PpdDriverPlatformProfile, ppd_driver_platform_profile, PPD_TYPE_DRIVER)
@@ -174,6 +177,9 @@ update_acpi_platform_profile_state (PpdDriverPlatformProfile *self)
 {
   PpdProfile new_profile;
 
+  if (self->can_taint && !self->tainted)
+    self->tainted = ppd_utils_try_taint ();
+
   new_profile = read_platform_profile ();
   if (new_profile == PPD_PROFILE_UNSET ||
       new_profile == self->acpi_platform_profile)
@@ -291,6 +297,9 @@ ppd_driver_platform_profile_probe (PpdDriver  *driver)
     return self->probe_result;
   }
 
+  /* Check for customisation that would invalidate our work */
+  self->can_taint = ppd_utils_can_taint ();
+
   /* Lenovo-specific proximity sensor */
   self->device = ppd_utils_find_device ("platform",
                                         (GCompareFunc) find_dytc,
diff --git a/src/ppd-utils.c b/src/ppd-utils.c
index 553a1e0894f2606019bbe0a5d6c0fd4cd2481526..ac8c7d93c85933fcd26bdb308c6b3655c1ae2dc9 100644
--- a/src/ppd-utils.c
+++ b/src/ppd-utils.c
@@ -115,3 +115,38 @@ ppd_utils_find_device (const char   *subsystem,
 
   return ret;
 }
+
+/* Custom fan curves used in asus-wmi module */
+#define ENABLED_FAN_CURVE_PROFILES "/sys/devices/platform/asus-nb-wmi/enabled_fan_curve_profiles"
+
+gboolean
+ppd_utils_can_taint (void)
+{
+  g_autofree char *fan_curves_file = NULL;
+  gboolean ret;
+
+  fan_curves_file = ppd_utils_get_sysfs_path (ENABLED_FAN_CURVE_PROFILES);
+  ret = g_file_test (fan_curves_file, G_FILE_TEST_IS_REGULAR);
+  g_debug ("%s %s: %s taint", ret ? "Detected" : "Didn't detect",
+           ENABLED_FAN_CURVE_PROFILES, ret ? "can" : "cannot");
+  return ret;
+}
+
+gboolean
+ppd_utils_try_taint (void)
+{
+  g_autofree char *fan_curves_file = NULL;
+  g_autofree char *contents = NULL;
+  g_autoptr(GError) error = NULL;
+
+  fan_curves_file = ppd_utils_get_sysfs_path (ENABLED_FAN_CURVE_PROFILES);
+  if (g_file_get_contents (fan_curves_file, &contents, NULL, &error)) {
+    if (g_strcmp0 (g_strchomp (contents), "") != 0) {
+      g_warning ("Custom fan curves are in use, please revert to defaults before reporting any problems");
+      return TRUE;
+    }
+  } else {
+    g_debug ("Failed to open %s: %s", ENABLED_FAN_CURVE_PROFILES, error->message);
+  }
+  return FALSE;
+}
diff --git a/src/ppd-utils.h b/src/ppd-utils.h
index 9b12e5b897cdba51e784abdc9b54066958da328d..3e32fc36bb017cd3f23bc9addaf0b3afba4e0547 100644
--- a/src/ppd-utils.h
+++ b/src/ppd-utils.h
@@ -26,3 +26,6 @@ GFileMonitor *ppd_utils_monitor_sysfs_attr (GUdevDevice  *device,
 GUdevDevice *ppd_utils_find_device (const char   *subsystem,
                                     GCompareFunc  func,
                                     gpointer      user_data);
+
+gboolean ppd_utils_can_taint (void);
+gboolean ppd_utils_try_taint (void);
diff --git a/tests/integration-test.py b/tests/integration-test.py
index a073e6ef5e4f7d85f3e0e2ca866c28c76b3f5bf6..969deab61b18e1969022b1798fdf786c289f596b 100755
--- a/tests/integration-test.py
+++ b/tests/integration-test.py
@@ -778,6 +778,43 @@ class Tests(dbusmock.DBusTestCase):
 
       self.stop_daemon()
 
+    def test_tainting(self):
+      '''check that custom fan curves throw a tainting warning'''
+
+      self.create_platform_profile()
+      fan_curves_dir = os.path.join(self.testbed.get_root_dir(), "sys/devices/platform/asus-nb-wmi/")
+      os.makedirs(fan_curves_dir)
+      fan_curves_path = os.path.join(fan_curves_dir, "enabled_fan_curve_profiles")
+      with open(fan_curves_path, 'w') as curves:
+        curves.write("profile here\n")
+
+      self.start_daemon()
+      self.assertEventually(lambda: self.have_text_in_log('Custom fan curves are in use'))
+      self.stop_daemon()
+
+      os.remove(fan_curves_path)
+      os.removedirs(fan_curves_dir)
+      self.remove_platform_profile()
+
+    def test_not_tainting(self):
+      '''check that fan curves don't throw a tainting warning if unset'''
+
+      self.create_platform_profile()
+      fan_curves_dir = os.path.join(self.testbed.get_root_dir(), "sys/devices/platform/asus-nb-wmi/")
+      os.makedirs(fan_curves_dir)
+      fan_curves_path = os.path.join(fan_curves_dir, "enabled_fan_curve_profiles")
+      with open(fan_curves_path, 'w') as curves:
+        curves.write("\n")
+
+      self.start_daemon()
+      self.assertEqual(self.get_dbus_property('ActiveProfile'), 'balanced')
+      self.assertEqual(self.count_text_in_log('Custom fan curves are in use'), 0)
+      self.stop_daemon()
+
+      os.remove(fan_curves_path)
+      os.removedirs(fan_curves_dir)
+      self.remove_platform_profile()
+
     #
     # Helper methods
     #