Using a Laptop as a PC Monitor via Wi-Fi: 3 Wirelessly Working Methods

When the main monitor breaks down and only a laptop is at hand, many users wonder: is it possible to use its screen as a replacement through wireless connectionThe answer is yes, but with important caveats. Unlike a wired connection via HDMI or DisplayPort, image transmission by Wi-Fi It has limitations in latency, resolution, and stability. However, for office tasks, document viewing, or even video streaming (with the right settings), this method is quite functional.

In this article, we will look at three proven ways to organize wireless mirroring or extended screen From PC to laptop: via built-in tools Windows (for systems with Miracast), specialized programs like SpaceDesk or Duet Display, as well as a universal solution for macOS And LinuxWe will pay special attention to the settings network parametersto minimize lag and connection interruptions. If your router supports 5 GHz - this will be the key to a smooth picture.

Before you begin, check two critical points: hardware compatibility (the laptop must support video reception via Wi-Fi) and network speed (minimum - 150 Mbps for Full HD). If your laptop is older than 2015, you may need an external Wi-Fi adapter with support Miracast or WiDi.

1. Compatibility check: Does your laptop support video reception via Wi-Fi?

Not all laptops can function as wireless monitors. Basic requirements:

• 🖥️ operating system: Windows 10/11 (with an update not lower than 1803), macOS 10.15+ or Linux with support Wayland.
• 📶 Wi-Fi adapter: must support Miracast (for Windows) or AirPlay (for macOS). You can check via device Manager → Network adapters.
• 🔧 Drivers: update your video card driver (Intel HD Graphics, NVIDIA, AMD Radeon) and Wi-Fi adapter to the latest version.
• 🔄 Network settings: Both devices must be connected to the same network 5 GHz (2.4 GHz will cause severe lags).

To check support Miracast V Windows, do it in Command line (Win + R → cmd):

netsh wlan show drivers | find "Miracast"

If the response contains a string Miracast support: Yes - your laptop is ready to connect. For macOS check availability AirPlay V System Preferences → Monitors.

⚠️ Attention: Laptops with AMD Ryzen up to the 3000 series often have problems with Miracast due to outdated drivers. In this case, use software solutions (Section 3).

2. Method 1: Built-in screen projection via Miracast (Windows only)

This is the easiest method if both devices support MiracastIt allows you to duplicate or extend your screen. without additional programs, but with resolution limitations (1920×1080 maximum) and frequency 30 Hz.

Instructions for Windows 10/11:

1. On your laptop (which will be your monitor), open Settings → System → Project to this PC.
2. Select Available everywhere or Available everywhere for online security.
3. On the main PC, click Win + P and select Connect to a wireless display.
4. Find your laptop's name in the list and connect. The first time you connect, you'll be asked to enter a PIN (it will appear on the laptop's screen).

If your laptop does not appear in the list:

• 🔌 Make sure both devices are connected to the same network 5 GHz.
• 🔄 Restart the service Wireless Display through Services (services.msc).
• 🛠️ Update your Wi-Fi adapter driver via Intel Driver & Support Assistant or the manufacturer's website.

⚠️ Attention: When using Miracast through a router with it turned on WPA3 There may be connection problems. Switch to WPA2-PSK in the router settings.

Update Wi-Fi driver on both devices|

Connect both devices to the 5GHz network|

Disable VPN and Firewalls|

Enable "Project to this PC" mode on your laptop|

Reboot your router if you have problems with detection-->

3. Method 2: Wireless Screen Mirroring Software

If Miracast does not work or requires advanced functionality (for example, sound over Wi-Fi or support 4K), use specialized software. We tested three solutions:

• 💻 SpaceDesk - a free option with minimal lags (supports up to 4K@30fps).
• 🎨 Duet Display — paid software ($20) with support Apple Pencil And 60 Hz (only for macOS/iOS + Windows).
• 🖥️ Splashtop Wired XDisplay - a universal option for Windows/macOS/Linux (free for personal use).

Step-by-step setup using SpaceDesk as an example:

1. Download SpaceDesk Driver on the main PC and SpaceDesk Viewer on a laptop with official website.
2. Install the driver on your PC and restart it.
3. Launch SpaceDesk Viewer on a laptop - it will automatically find the PC on the local network.
4. Select connection mode: Duplicate or Expand.
5. In the settings (F1) turn it off Hardware acceleration, if the image is slow.

For Duet Display you will need:

• Install the application on both devices.
• Connect via Duet Air (wireless mode) or USB (for minimal lags).
• Select in the settings Game Mode to reduce latency (useful for drawing).

4. Method 3: Universal solution for macOS and Linux

For users macOS And Linux a combination will do VNC servers And screen streamingThis method is more difficult to set up, but works on any device.

For macOS (using the built-in screen mirror):

1. On Mac (laptop) open System Preferences → Sharing.
2. Turn on Remote access and choose who is allowed to connect.
3. On PC with Windows install VNC Viewer (For example, RealVNC or TightVNC).
4. Connect by IP address Mac (you can find out through System Preferences → Network).

For Linux (we use x11vnc + ffmpeg):

# Install x11vnc on a laptop (Ubuntu/Debian)
sudo apt install x11vnc ffmpeg

Start the server with a password
x11vnc -rfbauth ~/.vnc/passwd -forever -shared

On your PC, connect via a VNC client using the laptop's IP address.

To transmit sound, please configure additional settings PulseAudio:

pactl load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1;192.168.1.0/24 auth-anonymous=1

⚠️ Attention: When using VNC the delay can reach 100–200 msThis method is not suitable for games or videos—it's only suitable for working with documents.

How to reduce lag in Linux

Use ffmpeg To stream your screen at a reduced bitrate:

ffmpeg -f x11grab -video_size 1920x1080 -framerate 30 -i :0.0 -c:v libx264 -preset ultrafast -tune zerolatency -f mpegts udp://192.168.1.100:1234

On PC, receive the stream via VLC by address udp://@:1234.

5. Network optimization for minimal lags

The picture quality over Wi-Fi depends on three factors: connection speed, channel congestion, and router settings. The following steps will help reduce latency:

• 📡 Switch to 5 GHz: In the router settings (192.168.1.1) turn it off 2.4 GHz or separate networks into different SSIDs.
• 🔗 Use a channel with minimal interference: IN Wi-Fi Analyzer (Android) or NetSpot (Windows/macOS) Find the least crowded channel (e.g. 36 or 149).
• 🚀 Enable QoS: In the router, prioritize traffic for the IP addresses of the PC and laptop (setting QoS → MAC/IP Priority).
• 🔌 Disable Wi-Fi power saving: IN Windows execute:

  powercfg /setacvalueindex SCHEME_CURRENT 19cbb8fa-5279-450e-9f78-d3be4c15e5a1 12bbebe6-58d6-4636-95bb-3217ef867c1a 0

Critical point: if your router does not support 802.11ac (Wi-Fi 5), maximum speed will be limited 150 Mbps, which is not enough for Full HD without lags. In this case, use Powerline adapters or wired connection.

6. Alternative Solutions: When Wi-Fi Isn't Enough

If a wireless connection is not possible due to a weak signal or high latency requirements (such as for gaming), consider alternatives:

• 🔌 Direct USB connection: Programs like Duet Display or iDisplay allow you to use your laptop as a monitor through USB 3.0 (delay <10 ms).
• 📡 Local area network via Ethernet: Connect the PC and laptop with a cable LAN and set up SpaceDesk or RDP.
• 🖥️ Hardware adapters: Devices like IOGEAR Wireless USB 3.0 create a direct connection between a PC and a laptop without a router.

For games or video editing the best option is with USB 3.0:

1. Connect your laptop to your PC via USB-C or USB-A 3.0.
2. Install Duet Display on both devices.
3. In the settings, select Game Mode and resolution 1920×1080@60Hz.

⚠️ Attention: When using USB 2.0 the delay will be 50–100 ms, which is unacceptable for dynamic tasks. Check the port version in Device Manager.

7. Common problems and their solutions

Even with proper setup, errors can still occur. Here are the most common ones and how to fix them:

• 🔴 "Device not found":
  • Make sure both devices are on the same network. 5 GHz.
  • Turn off your firewall (Windows Defender or Kaspersky) for 5 minutes.
  • Restart the service WDAGUtilityAccount through services.msc.
• 🖼️ Artifacts or jagged images:
  • Reduce the resolution to 1280×720.
  • Turn it off Hardware acceleration in the program settings.
  • Update your graphics card driver to the latest version.
• 🔊 No sound:
  • IN SpaceDesk the sound is not transmitted - use Voicemeeter to redirect audio.
  • IN Duet Display turn on Audio Output in the settings.

If the laptop connects but the screen flickers:

# For Linux (Ubuntu)
sudo nano /etc/X11/xorg.conf
Add the line:
Option "TearFree" "true"

For Windows turn it off Variable Refresh Rate in the monitor settings (Settings → System → Display → Advanced display settings).

How to reset Miracast settings in Windows

If the connection keeps dropping, please follow these steps: Command prompt (administrator):

netsh wlan set hostednetwork mode=disallow netsh wlan set hostednetwork mode=allow netsh wlan start hostednetwork

FAQ: Answers to frequently asked questions

Is it possible to use a laptop as a PC monitor via Wi-Fi without any software?

Yes, but only if both devices support it. Miracast (built-in function in Windows 10/11). For macOS or Linux programs are mandatory.

What is the minimum Wi-Fi speed required for Full HD?

For permission 1920×1080@30fps stable required 150–200 Mbps. At 60fps — from 300 MbpsCheck your speed through Speedtest on both devices.

Why isn't the sound transmitted over Wi-Fi?

Most programs (except Duet Display And Splashtop) do not support audio transmission. Solution: use Voicemeeter or VB-Cable to redirect audio over the network.

Is it possible to play through such a connection?

Technically yes, but with some caveats: there will be a delay 30–100 ms (depending on the method). For shooters, this is critical, but for strategy or simulation games, it's tolerable. The optimal option for games is Duet Display By USB 3.0.

Does this method work to connect MacBook to PC?

Yes, but with restrictions:

• Through AirPlay (required) Apple TV or software AirServer on PC).
• Through SpaceDesk or Splashtop (universal solutions).
• Miracast on macOS not supported.