Index: gnome-shell-3.24.2/js/ui/screenShield.js
===================================================================
--- gnome-shell-3.24.2.orig/js/ui/screenShield.js
+++ gnome-shell-3.24.2/js/ui/screenShield.js
@@ -438,6 +438,8 @@ const ScreenShield = new Lang.Class({
         this.actor = Main.layoutManager.screenShieldGroup;
 
         this._lockScreenState = MessageTray.State.HIDDEN;
+        this._last_x = -1;
+        this._last_y = -1;
         this._lockScreenGroup = new St.Widget({ x_expand: true,
                                                 y_expand: true,
                                                 reactive: true,
@@ -447,6 +449,8 @@ const ScreenShield = new Lang.Class({
                                               });
         this._lockScreenGroup.connect('key-press-event',
                                       Lang.bind(this, this._onLockScreenKeyPress));
+        this._lockScreenGroup.connect('motion-event',
+                                      Lang.bind(this, this._onLockScreenMotion));
         this._lockScreenGroup.connect('scroll-event',
                                       Lang.bind(this, this._onLockScreenScroll));
         Main.ctrlAltTabManager.addGroup(this._lockScreenGroup, _("Lock"), 'changes-prevent-symbolic');
@@ -686,6 +690,25 @@ const ScreenShield = new Lang.Class({
         return Clutter.EVENT_STOP;
     },
 
+    _onLockScreenMotion: function(actor, event) {
+        if (this._lockScreenState != MessageTray.State.SHOWN)
+            return false;
+        let [X, Y] = event.get_coords();
+
+        if (this._last_x == -1)
+            this._last_x = X;
+        if (this._last_y == -1)
+            this._last_y = Y;
+
+        let min_distance = 10
+        let distance = Math.max(Math.abs(this._last_x - X),
+                                Math.abs(this._last_y - Y));
+
+        if (distance >= min_distance)
+            this._liftShield(true, 0);
+        return true;
+    },
+
     _onLockScreenScroll: function(actor, event) {
         if (this._lockScreenState != MessageTray.State.SHOWN)
             return Clutter.EVENT_PROPAGATE;
@@ -1005,6 +1028,8 @@ const ScreenShield = new Lang.Class({
             return;
 
         this._ensureLockScreen();
+        this._last_x = -1;
+        this._last_y = -1;
         this._lockDialogGroup.scale_x = 1;
         this._lockDialogGroup.scale_y = 1;