From 3c9473be5e24baff49a71090fadb3f141e8e593c Mon Sep 17 00:00:00 2001
From: Jamie Walch <[email protected]>
Date: Mon, 21 Sep 2026 17:05:36 -0700
Subject: [PATCH] [remoting] Filter out XTest motion in LocalMouseInputMonitorX11 and disable X11 echo filtering

Update LocalMouseInputMonitorX11 to ignore RawMotion events originating
from XTEST virtual devices (sharing GetXTestDeviceIds with
LocalHotkeyInputMonitorX11) so remote XTest-injected pointer motion is
never reported as local mouse activity.

With self-filtering in place on X11, disable position-based echo
filtering in RemoteInputFilter (SetExpectLocalEcho(false)) on Linux X11
in both PeerSessionImpl and DesktopSessionAgent while retaining it for
Wayland sessions (PipewireLocalInputMonitor).

TAG=agy
CONV=4b851193-d649-43a8-8a69-eabdd12dba8b

Bug: b:562978160
Fixed: b:562978160
Change-Id: Ibee8190d191618ce024640ad106cc0d89769d8ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8435388
Reviewed-by: Lambros Lambrou <[email protected]>
Auto-Submit: Jamie Walch <[email protected]>
Commit-Queue: Lambros Lambrou <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1702230}
---
diff --git a/remoting/host/desktop_session_agent.cc b/remoting/host/desktop_session_agent.cc
index 8efcf75..13becedb 100644
--- a/remoting/host/desktop_session_agent.cc
+++ b/remoting/host/desktop_session_agent.cc
@@ -50,6 +50,7 @@
 #include "remoting/proto/url_forwarder_control.pb.h"
 #include "remoting/protocol/clipboard_stub.h"
 #include "remoting/protocol/input_event_tracker.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
 #include "ui/events/types/event_type.h"
@@ -678,7 +679,13 @@
   // LocalInputMonitorWin filters out an echo of the injected input before it
   // reaches |remote_input_filter_|.
   remote_input_filter_->SetExpectLocalEcho(false);
-#endif  // BUILDFLAG(IS_WIN)
+#elif BUILDFLAG(IS_LINUX)
+  // LocalMouseInputMonitorX11 filters out XTest-injected input before it
+  // reaches `remote_input_filter_`.
+  if (!webrtc::DesktopCapturer::IsRunningUnderWayland()) {
+    remote_input_filter_->SetExpectLocalEcho(false);
+  }
+#endif
 
   // Start the input injector.
   std::unique_ptr<protocol::ClipboardStub> clipboard_stub(
diff --git a/remoting/host/input_monitor/local_hotkey_input_monitor_x11.cc b/remoting/host/input_monitor/local_hotkey_input_monitor_x11.cc
index b72fc0f..9c9cdaa8 100644
--- a/remoting/host/input_monitor/local_hotkey_input_monitor_x11.cc
+++ b/remoting/host/input_monitor/local_hotkey_input_monitor_x11.cc
@@ -86,20 +86,7 @@
 
 void LocalHotkeyInputMonitorX11::Core::UpdateXTestDeviceIds() {
   DCHECK(input_task_runner_->BelongsToCurrentThread());
-  xtest_device_ids_.clear();
-
-  auto reply =
-      connection_->xinput().XIQueryDevice({x11::Input::DeviceId::All}).Sync();
-  if (!reply) {
-    LOG(ERROR) << "XIQueryDevice failed.";
-    return;
-  }
-  for (const auto& info : reply->infos) {
-    if (info.name.ends_with("XTEST keyboard") ||
-        info.name.ends_with("XTEST pointer")) {
-      xtest_device_ids_.insert(info.deviceid);
-    }
-  }
+  xtest_device_ids_ = GetXTestDeviceIds(connection_);
 }
 
 bool LocalHotkeyInputMonitorX11::Core::IsXTestDevice(
diff --git a/remoting/host/input_monitor/local_input_monitor_x11_common.cc b/remoting/host/input_monitor/local_input_monitor_x11_common.cc
index cc40c32..d5e331a 100644
--- a/remoting/host/input_monitor/local_input_monitor_x11_common.cc
+++ b/remoting/host/input_monitor/local_input_monitor_x11_common.cc
@@ -5,6 +5,8 @@
 #include "remoting/host/input_monitor/local_input_monitor_x11_common.h"
 
 #include "base/containers/span.h"
+#include "base/logging.h"
+#include "ui/gfx/x/future.h"
 
 namespace remoting {
 
@@ -19,4 +21,22 @@
   return mask;
 }
 
+base::flat_set<x11::Input::DeviceId> GetXTestDeviceIds(
+    x11::Connection* connection) {
+  base::flat_set<x11::Input::DeviceId> xtest_device_ids;
+  auto reply =
+      connection->xinput().XIQueryDevice({x11::Input::DeviceId::All}).Sync();
+  if (!reply) {
+    LOG(ERROR) << "XIQueryDevice failed.";
+    return xtest_device_ids;
+  }
+  for (const auto& info : reply->infos) {
+    if (info.name.ends_with("XTEST keyboard") ||
+        info.name.ends_with("XTEST pointer")) {
+      xtest_device_ids.insert(info.deviceid);
+    }
+  }
+  return xtest_device_ids;
+}
+
 }  // namespace remoting
diff --git a/remoting/host/input_monitor/local_input_monitor_x11_common.h b/remoting/host/input_monitor/local_input_monitor_x11_common.h
index b3f197d..c616ed6 100644
--- a/remoting/host/input_monitor/local_input_monitor_x11_common.h
+++ b/remoting/host/input_monitor/local_input_monitor_x11_common.h
@@ -5,7 +5,9 @@
 #ifndef REMOTING_HOST_INPUT_MONITOR_LOCAL_INPUT_MONITOR_X11_COMMON_H_
 #define REMOTING_HOST_INPUT_MONITOR_LOCAL_INPUT_MONITOR_X11_COMMON_H_
 
+#include "base/containers/flat_set.h"
 #include "ui/events/devices/x11/xinput_util.h"
+#include "ui/gfx/x/connection.h"
 #include "ui/gfx/x/xinput.h"
 
 namespace remoting {
@@ -15,6 +17,11 @@
 // the same mask.
 x11::Input::XIEventMask CommonXIEventMaskForRootWindow();
 
+// Queries XInput2 and returns the set of DeviceIds corresponding to synthetic
+// XTEST devices ("XTEST keyboard" and "XTEST pointer").
+base::flat_set<x11::Input::DeviceId> GetXTestDeviceIds(
+    x11::Connection* connection);
+
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_INPUT_MONITOR_LOCAL_INPUT_MONITOR_X11_COMMON_H_
diff --git a/remoting/host/input_monitor/local_mouse_input_monitor_x11.cc b/remoting/host/input_monitor/local_mouse_input_monitor_x11.cc
index 6e51893a..1a73f1dd 100644
--- a/remoting/host/input_monitor/local_mouse_input_monitor_x11.cc
+++ b/remoting/host/input_monitor/local_mouse_input_monitor_x11.cc
@@ -81,6 +81,8 @@
     return;
   }
 
+  xtest_device_ids_ = GetXTestDeviceIds(connection_);
+
   auto mask = CommonXIEventMaskForRootWindow();
   connection_->xinput().XISelectEvents(
       {connection_->default_root(),
@@ -93,6 +95,12 @@
   connection_->RemoveEventObserver(this);
 }
 
+bool LocalMouseInputMonitorX11::Core::IsXTestDevice(
+    x11::Input::DeviceId device_id) const {
+  DCHECK(input_task_runner_->BelongsToCurrentThread());
+  return xtest_device_ids_.contains(device_id);
+}
+
 void LocalMouseInputMonitorX11::Core::OnEvent(const x11::Event& event) {
   DCHECK(input_task_runner_->BelongsToCurrentThread());
 
@@ -105,6 +113,11 @@
   if (raw->opcode != x11::Input::RawDeviceEvent::RawMotion) {
     return;
   }
+  // Ignore events injected via XTEST so remote input is not mistaken for local
+  // mouse activity.
+  if (IsXTestDevice(raw->sourceid)) {
+    return;
+  }
 
   connection_->QueryPointer({connection_->default_root()})
       .OnResponse(base::BindOnce(
diff --git a/remoting/host/input_monitor/local_mouse_input_monitor_x11.h b/remoting/host/input_monitor/local_mouse_input_monitor_x11.h
index fdcc1303..6593e7ea 100644
--- a/remoting/host/input_monitor/local_mouse_input_monitor_x11.h
+++ b/remoting/host/input_monitor/local_mouse_input_monitor_x11.h
@@ -5,6 +5,7 @@
 #ifndef REMOTING_HOST_INPUT_MONITOR_LOCAL_MOUSE_INPUT_MONITOR_X11_H_
 #define REMOTING_HOST_INPUT_MONITOR_LOCAL_MOUSE_INPUT_MONITOR_X11_H_
 
+#include "base/containers/flat_set.h"
 #include "base/memory/raw_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequence_checker.h"
@@ -50,8 +51,7 @@
 
     void StartOnInputThread();
     void StopOnInputThread();
-    // Called when there are pending X events.
-    void OnConnectionData();
+    bool IsXTestDevice(x11::Input::DeviceId device_id) const;
 
     // x11::EventObserver:
     void OnEvent(const x11::Event& event) override;
@@ -65,6 +65,9 @@
     // Used to send mouse event notifications.
     LocalInputMonitor::PointerMoveCallback on_mouse_move_;
 
+    // Cached XTEST device IDs to ignore synthetic events.
+    base::flat_set<x11::Input::DeviceId> xtest_device_ids_;
+
     raw_ptr<x11::Connection> connection_ = nullptr;
   };
 
diff --git a/remoting/host/peer_session_impl.cc b/remoting/host/peer_session_impl.cc
index 2a4c3f7..17a4a0d 100644
--- a/remoting/host/peer_session_impl.cc
+++ b/remoting/host/peer_session_impl.cc
@@ -95,6 +95,7 @@
 #include "remoting/protocol/webrtc_connection_to_client.h"
 #include "remoting/protocol/webrtc_video_stream.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capture_types.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
 #include "ui/events/types/event_type.h"
@@ -154,7 +155,15 @@
   // LocalMouseInputMonitorMac filter out an echo of the injected input before
   // it reaches `remote_input_filter_`.
   input_pipeline_.remote_input_filter()->SetExpectLocalEcho(false);
-#endif  // BUILDFLAG(IS_WIN) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
+#elif BUILDFLAG(IS_LINUX)
+  // LocalMouseInputMonitorX11 filters out XTest-injected input before it
+  // reaches `remote_input_filter_`. On Wayland, PipewireLocalInputMonitor
+  // observes global cursor positions from PipeWire and still relies on echo
+  // filtering.
+  if (!webrtc::DesktopCapturer::IsRunningUnderWayland()) {
+    input_pipeline_.remote_input_filter()->SetExpectLocalEcho(false);
+  }
+#endif
 }
 
 void PeerSessionImpl::Start(
diff --git a/remoting/host/input_monitor/local_mouse_input_monitor_x11_unittest.cc b/remoting/host/input_monitor/local_mouse_input_monitor_x11_unittest.cc
new file mode 100644
index 0000000..87f3ca9
--- /dev/null
+++ b/remoting/host/input_monitor/local_mouse_input_monitor_x11_unittest.cc
@@ -0,0 +1,138 @@
+// Copyright 2026 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <memory>
+#include <utility>
+
+#include "base/functional/callback_helpers.h"
+#include "base/run_loop.h"
+#include "base/test/task_environment.h"
+#include "base/test/test_future.h"
+#include "remoting/host/input_monitor/local_input_monitor.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
+#include "ui/events/event.h"
+#include "ui/gfx/x/connection.h"
+#include "ui/gfx/x/event.h"
+#include "ui/gfx/x/future.h"
+#include "ui/gfx/x/xinput.h"
+#include "ui/gfx/x/xproto.h"
+#include "ui/gfx/x/xtest.h"
+
+namespace remoting {
+
+class LocalMouseInputMonitorX11Test : public testing::Test {
+ public:
+  LocalMouseInputMonitorX11Test()
+      : task_environment_(base::test::TaskEnvironment::MainThreadType::UI) {}
+
+  void SetUp() override {
+    connection_ = x11::Connection::Get();
+    ASSERT_NE(connection_, nullptr);
+    ASSERT_TRUE(connection_->Ready());
+    ASSERT_TRUE(connection_->xinput().present());
+
+    auto reply =
+        connection_->xinput().XIQueryDevice({x11::Input::DeviceId::All}).Sync();
+    ASSERT_TRUE(reply);
+    for (const auto& info : reply->infos) {
+      if (info.type == x11::Input::DeviceType::MasterPointer) {
+        master_pointer_id_ = info.deviceid;
+      } else if (info.name.ends_with("XTEST pointer")) {
+        xtest_pointer_id_ = info.deviceid;
+      }
+    }
+    ASSERT_NE(master_pointer_id_, x11::Input::DeviceId{});
+    ASSERT_NE(xtest_pointer_id_, x11::Input::DeviceId{});
+    ASSERT_NE(xtest_pointer_id_, kLocalPointerId);
+
+    auto task_runner = task_environment_.GetMainThreadTaskRunner();
+    monitor_ =
+        LocalInputMonitor::Create(task_runner, task_runner, task_runner);
+    monitor_->StartMonitoring(pointer_move_future_.GetRepeatingCallback(),
+                              LocalInputMonitor::KeyPressedCallback(),
+                              base::DoNothing());
+    FlushTaskRunner();
+    connection_->Sync();
+    connection_->DispatchAll();
+  }
+
+  void TearDown() override {
+    monitor_.reset();
+    FlushTaskRunner();
+  }
+
+  void DispatchRawMotionEvent(x11::Input::DeviceId source_id) {
+    x11::Input::RawDeviceEvent raw_event;
+    raw_event.opcode = x11::Input::RawDeviceEvent::RawMotion;
+    raw_event.deviceid = master_pointer_id_;
+    raw_event.sourceid = source_id;
+
+    x11::Event event(false, std::move(raw_event));
+    connection_->DispatchEvent(event);
+    connection_->Sync();
+    connection_->DispatchAll();
+    FlushTaskRunner();
+  }
+
+  void InjectXTestMotionEvent(int16_t x, int16_t y) {
+    ASSERT_TRUE(connection_->xtest().present());
+    connection_->xtest().FakeInput({
+        .type = x11::MotionNotifyEvent::opcode,
+        .detail = false,
+        .root = connection_->default_root(),
+        .rootX = x,
+        .rootY = y,
+    });
+    connection_->Sync();
+    connection_->DispatchAll();
+    FlushTaskRunner();
+  }
+
+  void FlushTaskRunner() {
+    base::RunLoop run_loop;
+    task_environment_.GetMainThreadTaskRunner()->PostTask(
+        FROM_HERE, run_loop.QuitClosure());
+    run_loop.Run();
+  }
+
+ protected:
+  // Headless Xorg (used by testing/xvfb.py on CQ bots) only creates the master
+  // devices and the virtual XTEST devices, with no physical pointer attached.
+  // Use a distinct synthetic DeviceId to represent a physical pointer when
+  // dispatching RawDeviceEvents.
+  static constexpr x11::Input::DeviceId kLocalPointerId{100};
+
+  base::test::SingleThreadTaskEnvironment task_environment_;
+  raw_ptr<x11::Connection> connection_ = nullptr;
+  x11::Input::DeviceId master_pointer_id_{};
+  x11::Input::DeviceId xtest_pointer_id_{};
+  x11::Input::DeviceId local_pointer_id_{kLocalPointerId};
+  base::test::TestFuture<const webrtc::DesktopVector&, ui::EventType>
+      pointer_move_future_;
+  std::unique_ptr<LocalInputMonitor> monitor_;
+};
+
+TEST_F(LocalMouseInputMonitorX11Test, LocalMotionTriggersCallback) {
+  DispatchRawMotionEvent(local_pointer_id_);
+
+  ASSERT_TRUE(pointer_move_future_.Wait());
+  EXPECT_EQ(pointer_move_future_.Get<1>(), ui::EventType::kMouseMoved);
+}
+
+TEST_F(LocalMouseInputMonitorX11Test,
+       RemoteInjectedXTestMotionDoesNotTriggerCallback) {
+  DispatchRawMotionEvent(xtest_pointer_id_);
+  InjectXTestMotionEvent(100, 100);
+  InjectXTestMotionEvent(101, 100);
+
+  EXPECT_FALSE(pointer_move_future_.IsReady());
+
+  // Subsequent local motion should still be detected.
+  DispatchRawMotionEvent(local_pointer_id_);
+  ASSERT_TRUE(pointer_move_future_.Wait());
+  EXPECT_EQ(pointer_move_future_.Get<1>(), ui::EventType::kMouseMoved);
+}
+
+}  // namespace remoting
diff --git a/remoting/host/peer_session_impl_unittest.cc b/remoting/host/peer_session_impl_unittest.cc
index 901e447..01d0536 100644
--- a/remoting/host/peer_session_impl_unittest.cc
+++ b/remoting/host/peer_session_impl_unittest.cc
@@ -59,6 +59,7 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capture_types.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "ui/events/event.h"
 
@@ -520,11 +521,13 @@
   connection_->input_stub()->InjectMouseEvent(MakeFractionalMouseMoveEvent(
       100, 101, kDisplay1Id, kDisplay1Width, kDisplay1Height));
... (file diff truncated)

diff --git a/remoting/host/input_monitor/local_mouse_input_monitor_x11_unittest.cc b/remoting/host/input_monitor/local_mouse_input_monitor_x11_unittest.cc
new file mode 100644
index 0000000..87f3ca9
--- /dev/null
+++ b/remoting/host/input_monitor/local_mouse_input_monitor_x11_unittest.cc
@@ -0,0 +1,138 @@
+// Copyright 2026 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <memory>
+#include <utility>
+
+#include "base/functional/callback_helpers.h"
+#include "base/run_loop.h"
+#include "base/test/task_environment.h"
+#include "base/test/test_future.h"
+#include "remoting/host/input_monitor/local_input_monitor.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
+#include "ui/events/event.h"
+#include "ui/gfx/x/connection.h"
+#include "ui/gfx/x/event.h"
+#include "ui/gfx/x/future.h"
+#include "ui/gfx/x/xinput.h"
+#include "ui/gfx/x/xproto.h"
+#include "ui/gfx/x/xtest.h"
+
+namespace remoting {
+
+class LocalMouseInputMonitorX11Test : public testing::Test {
+ public:
+  LocalMouseInputMonitorX11Test()
+      : task_environment_(base::test::TaskEnvironment::MainThreadType::UI) {}
+
+  void SetUp() override {
+    connection_ = x11::Connection::Get();
+    ASSERT_NE(connection_, nullptr);
+    ASSERT_TRUE(connection_->Ready());
+    ASSERT_TRUE(connection_->xinput().present());
+
+    auto reply =
+        connection_->xinput().XIQueryDevice({x11::Input::DeviceId::All}).Sync();
+    ASSERT_TRUE(reply);
+    for (const auto& info : reply->infos) {
+      if (info.type == x11::Input::DeviceType::MasterPointer) {
+        master_pointer_id_ = info.deviceid;
+      } else if (info.name.ends_with("XTEST pointer")) {
+        xtest_pointer_id_ = info.deviceid;
+      }
+    }
+    ASSERT_NE(master_pointer_id_, x11::Input::DeviceId{});
+    ASSERT_NE(xtest_pointer_id_, x11::Input::DeviceId{});
+    ASSERT_NE(xtest_pointer_id_, kLocalPointerId);
+
+    auto task_runner = task_environment_.GetMainThreadTaskRunner();
+    monitor_ =
+        LocalInputMonitor::Create(task_runner, task_runner, task_runner);
+    monitor_->StartMonitoring(pointer_move_future_.GetRepeatingCallback(),
+                              LocalInputMonitor::KeyPressedCallback(),
+                              base::DoNothing());
+    FlushTaskRunner();
+    connection_->Sync();
+    connection_->DispatchAll();
+  }
+
+  void TearDown() override {
+    monitor_.reset();
+    FlushTaskRunner();
+  }
+
+  void DispatchRawMotionEvent(x11::Input::DeviceId source_id) {
+    x11::Input::RawDeviceEvent raw_event;
+    raw_event.opcode = x11::Input::RawDeviceEvent::RawMotion;
+    raw_event.deviceid = master_pointer_id_;
+    raw_event.sourceid = source_id;
+
+    x11::Event event(false, std::move(raw_event));
+    connection_->DispatchEvent(event);
+    connection_->Sync();
+    connection_->DispatchAll();
+    FlushTaskRunner();
+  }
+
+  void InjectXTestMotionEvent(int16_t x, int16_t y) {
+    ASSERT_TRUE(connection_->xtest().present());
+    connection_->xtest().FakeInput({
+        .type = x11::MotionNotifyEvent::opcode,
+        .detail = false,
+        .root = connection_->default_root(),
+        .rootX = x,
+        .rootY = y,
+    });
+    connection_->Sync();
+    connection_->DispatchAll();
+    FlushTaskRunner();
+  }
+
+  void FlushTaskRunner() {
+    base::RunLoop run_loop;
+    task_environment_.GetMainThreadTaskRunner()->PostTask(
+        FROM_HERE, run_loop.QuitClosure());
+    run_loop.Run();
+  }
+
+ protected:
+  // Headless Xorg (used by testing/xvfb.py on CQ bots) only creates the master
+  // devices and the virtual XTEST devices, with no physical pointer attached.
+  // Use a distinct synthetic DeviceId to represent a physical pointer when
+  // dispatching RawDeviceEvents.
+  static constexpr x11::Input::DeviceId kLocalPointerId{100};
+
+  base::test::SingleThreadTaskEnvironment task_environment_;
+  raw_ptr<x11::Connection> connection_ = nullptr;
+  x11::Input::DeviceId master_pointer_id_{};
+  x11::Input::DeviceId xtest_pointer_id_{};
+  x11::Input::DeviceId local_pointer_id_{kLocalPointerId};
+  base::test::TestFuture<const webrtc::DesktopVector&, ui::EventType>
+      pointer_move_future_;
+  std::unique_ptr<LocalInputMonitor> monitor_;
+};
+
+TEST_F(LocalMouseInputMonitorX11Test, LocalMotionTriggersCallback) {
+  DispatchRawMotionEvent(local_pointer_id_);
+
+  ASSERT_TRUE(pointer_move_future_.Wait());
+  EXPECT_EQ(pointer_move_future_.Get<1>(), ui::EventType::kMouseMoved);
+}
+
+TEST_F(LocalMouseInputMonitorX11Test,
+       RemoteInjectedXTestMotionDoesNotTriggerCallback) {
+  DispatchRawMotionEvent(xtest_pointer_id_);
+  InjectXTestMotionEvent(100, 100);
+  InjectXTestMotionEvent(101, 100);
+
+  EXPECT_FALSE(pointer_move_future_.IsReady());
+
+  // Subsequent local motion should still be detected.
+  DispatchRawMotionEvent(local_pointer_id_);
+  ASSERT_TRUE(pointer_move_future_.Wait());
+  EXPECT_EQ(pointer_move_future_.Get<1>(), ui::EventType::kMouseMoved);
+}
+
+}  // namespace remoting
diff --git a/remoting/host/peer_session_impl_unittest.cc b/remoting/host/peer_session_impl_unittest.cc
index 901e447..01d0536 100644
--- a/remoting/host/peer_session_impl_unittest.cc
+++ b/remoting/host/peer_session_impl_unittest.cc
@@ -59,6 +59,7 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capture_types.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "ui/events/event.h"
 
@@ -520,11 +521,13 @@
   connection_->input_stub()->InjectMouseEvent(MakeFractionalMouseMoveEvent(
       100, 101, kDisplay1Id, kDisplay1Width, kDisplay1Height));
 
-#if !BUILDFLAG(IS_WIN) && !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_MAC)
-  // The OS echoes the injected event back.
-  peer_session_->OnLocalPointerMoved(webrtc::DesktopVector(100, 101),
-                                     ui::EventType::kMouseMoved);
-#endif  // !BUILDFLAG(IS_WIN) && !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_MAC)
+#if BUILDFLAG(IS_LINUX)
+  if (webrtc::DesktopCapturer::IsRunningUnderWayland()) {
+    // Under Wayland, PipewireLocalInputMonitor echoes the injected event back.
+    peer_session_->OnLocalPointerMoved(webrtc::DesktopVector(100, 101),
+                                       ui::EventType::kMouseMoved);
+  }
+#endif  // BUILDFLAG(IS_LINUX)
 
   // This one should get through as well.
   connection_->input_stub()->InjectMouseEvent(MakeFractionalMouseMoveEvent(
@@ -622,8 +625,6 @@
               EqualsMouseMoveEvent(kDisplay1Width - 1, kDisplay1Height - 1));
 }
 
-
-
 TEST_F(PeerSessionImplTest, DataChannelCallbackIsCalled) {
   ConnectPeerSession();