--- /home/franck/devel/deb-packaging/unity-7.2.0+14.04.20140416/lockscreen/UserAuthenticatorPam.old
+++ /home/franck/devel/deb-packaging/unity-7.2.0+14.04.20140416/lockscreen/UserAuthenticatorPam.cpp
@@ -71,7 +71,7 @@
   conversation.appdata_ptr = static_cast<void*>(this);
 
   // FIXME (andy) We should install our own unityshell pam file.
-  return pam_start("lightdm", username_.c_str(),
+  return pam_start("lightdm-lockscreen", username_.c_str(),
                    &conversation, &pam_handle_) == PAM_SUCCESS;
 }