diff --git a/repos/demo/src/server/liquid_framebuffer/services.cc b/repos/demo/src/server/liquid_framebuffer/services.cc
index b2c1a3a203..bec5a210c2 100644
--- a/repos/demo/src/server/liquid_framebuffer/services.cc
+++ b/repos/demo/src/server/liquid_framebuffer/services.cc
@@ -264,6 +264,8 @@ class Framebuffer::Session_component : public Genode::Rpc_object<Session>
 			_timer.trigger_periodic(10*1000);
 		}
 
+		void sync_source(Session_label const &) override { }
+
 		void refresh(Rect rect) override
 		{
 			_window_content.redraw_area(rect.x1(), rect.y1(), rect.w(), rect.h());
diff --git a/repos/gems/src/server/gui_fader/main.cc b/repos/gems/src/server/gui_fader/main.cc
index f382d36c74..f9b391077f 100644
--- a/repos/gems/src/server/gui_fader/main.cc
+++ b/repos/gems/src/server/gui_fader/main.cc
@@ -290,6 +290,8 @@ class Gui_fader::Framebuffer_session_component
 		{
 			_gui.framebuffer.sync_sigh(sigh);
 		}
+
+		void sync_source(Genode::Session_label const &) override { }
 };
 
 
diff --git a/repos/os/include/framebuffer_session/client.h b/repos/os/include/framebuffer_session/client.h
index 0e563fb774..b70b93ca3d 100644
--- a/repos/os/include/framebuffer_session/client.h
+++ b/repos/os/include/framebuffer_session/client.h
@@ -32,6 +32,8 @@ struct Framebuffer::Session_client : Rpc_client<Session>
 
 	void sync_sigh(Signal_context_capability sigh) override { call<Rpc_sync_sigh>(sigh); }
 
+	void sync_source(Session_label const &source) override { call<Rpc_sync_source>(source); }
+
 	void refresh(Rect rect) override { call<Rpc_refresh>(rect); }
 
 	/**
diff --git a/repos/os/include/framebuffer_session/framebuffer_session.h b/repos/os/include/framebuffer_session/framebuffer_session.h
index 9b6137fb59..b3dde2ba86 100644
--- a/repos/os/include/framebuffer_session/framebuffer_session.h
+++ b/repos/os/include/framebuffer_session/framebuffer_session.h
@@ -210,6 +210,19 @@ struct Framebuffer::Session : Genode::Session
 	 */
 	virtual void sync_sigh(Signal_context_capability) = 0;
 
+	/**
+	 * Define the preferred source of sync signals
+	 *
+	 * In the presence of multiple capture clients at the GUI server, each
+	 * client captures the GUI at independent refresh rates. Hence, there is
+	 * no single source of sync signals but there can be multiple. From the
+	 * application's perspective, the most adequate sync source may depend on
+	 * the positions of the capture clients at the GUI server and the position
+	 * of the application's view. By specifying a capture client's label as
+	 * 'sync_sigh', the application can take an informed decision.
+	 */
+	virtual void sync_source(Session_label const &) = 0;
+
 
 	/*********************
 	 ** RPC declaration **
@@ -222,9 +235,10 @@ struct Framebuffer::Session : Genode::Session
 	GENODE_RPC(Rpc_panning, void, panning, Point);
 	GENODE_RPC(Rpc_mode_sigh, void, mode_sigh, Signal_context_capability);
 	GENODE_RPC(Rpc_sync_sigh, void, sync_sigh, Signal_context_capability);
+	GENODE_RPC(Rpc_sync_source, void, sync_source, Session_label const &);
 
 	GENODE_RPC_INTERFACE(Rpc_dataspace, Rpc_mode, Rpc_mode_sigh, Rpc_refresh,
-	                     Rpc_blit, Rpc_panning, Rpc_sync_sigh);
+	                     Rpc_blit, Rpc_panning, Rpc_sync_sigh, Rpc_sync_source);
 };
 
 #endif /* _INCLUDE__FRAMEBUFFER_SESSION__FRAMEBUFFER_SESSION_H_ */
diff --git a/repos/os/src/server/gui_fb/main.cc b/repos/os/src/server/gui_fb/main.cc
index f598565e9f..2dda709b04 100644
--- a/repos/os/src/server/gui_fb/main.cc
+++ b/repos/os/src/server/gui_fb/main.cc
@@ -238,6 +238,8 @@ struct Framebuffer::Session_component : Genode::Rpc_object<Framebuffer::Session>
 
 		_gui.framebuffer.sync_sigh(sigh);
 	}
+
+	void sync_source(Session_label const &) override { }
 };
 
 
diff --git a/repos/os/src/server/nitpicker/framebuffer_session.h b/repos/os/src/server/nitpicker/framebuffer_session.h
index c38e7f9039..72628a13ff 100644
--- a/repos/os/src/server/nitpicker/framebuffer_session.h
+++ b/repos/os/src/server/nitpicker/framebuffer_session.h
@@ -113,6 +113,8 @@ class Framebuffer::Session_component : public Rpc_object<Session>
 			_sync_sigh = sigh;
 		}
 
+		void sync_source(Session_label const &) override { }
+
 		void refresh(Rect) override;
 
 		Blit_result blit(Blit_batch const &) override;