Wireless Display Optional Feature - Use your laptop as Wireless Monitor | Casting from Laptop to Laptop

Windows has a built-in Wireless Display feature that can let you use one laptop as a second monitor for another Windows laptop, without HDMI.

On the laptop you want to use as the monitor

1. Open Settings → System → Projecting to this PC.
2. If Windows says the feature isn't installed, click Optional features.
3. Select View features / Add an optional feature.
4. Search for Wireless Display.
5. Install it.
6. After installation, open Wireless Display from the Start menu.
7. Keep this window open.

On the main laptop

Press:

Windows + K

You should see the second laptop under available wireless displays.

Select it and wait for the connection.

Then press:

Windows + P

and select:

• Duplicate → same screen on both laptops
• Extend → use the second laptop as an additional monitor ⭐
• Second screen only → display only on the second laptop

Important requirements

Both laptops should:

• Run Windows 10/11
• Support Miracast
• Have Wi-Fi enabled
• Ideally be connected to the same Wi-Fi network

If "Wireless Display" doesn't work

On the receiving laptop, go to:

Settings → System → Optional features → View features → Wireless Display

Make sure it is installed.

You can also check Miracast support by pressing:

Windows + R → type dxdiag → Save All Information

Then search the saved file for Miracast.

One important limitation

Wireless Display is convenient, but there can be noticeable latency, so it's good for:

• Coding
• Documents
• Teams/Office work
• Browsing
• Monitoring another PC

It is less suitable for:

• Gaming
• High-frame-rate video editing
• Real-time applications

If your two laptops don't support Miracast, there are also ways to use one laptop as a monitor through USB hardware, HDMI capture, or third-party software.

Problem:

I can see below information from dxdiag save all information

Line   22:                  Miracast: Available, with HDCP

Line   93:             Miracast: Not Supported by Graphics driver

Fix:

That output is actually useful. It means your laptop has partial Miracast support:

Miracast: Available, with HDCP
Miracast: Not Supported by Graphics driver

The second line is the problem. Your graphics driver currently does not support Miracast, so Windows Wireless Display may not work correctly as a receiver.

What I recommend

1. Check which graphics adapter is causing it

Open:

Device Manager → Display adapters

You may see something like:

• Intel UHD/Iris Xe Graphics

• NVIDIA GeForce

• AMD Radeon

Also check:

Device Manager → Network adapters

for your Wi-Fi adapter.

2. Update the graphics driver

First try Windows Update:

Settings → Windows Update → Advanced options → Optional updates → Driver updates

Look for a display/graphics driver.

For a laptop, I recommend getting the latest graphics driver from the laptop manufacturer's support page rather than immediately using a generic driver.

3. Restart and check again

Run:

Win + R
dxdiag

Save the information again and search for:

Miracast

Ideally you want:

Miracast: Available, with HDCP

and not:

Miracast: Not Supported by Graphics driver

There is another thing to check

Even if the graphics driver is fixed, the Wi-Fi adapter/driver on the receiving laptop also needs to support Miracast.

You can check:

Device Manager
→ Network adapters
→ Your Wi-Fi adapter

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If you want to use the laptop as a monitor immediately

You don't necessarily need Miracast.

If your goal is:

Laptop A → use Laptop B as a second monitor

and Miracast isn't supported, you have alternatives:

Method	Extra hardware	Latency	My recommendation
Wireless Display/Miracast	No	Medium	⭐ Try fixing driver
USB capture card	Yes	Low/Medium	⭐⭐⭐ Very reliable
HDMI capture	Yes	Low	⭐⭐⭐ Best for video
Third-party network software	No	Medium	⭐⭐ Easy
Remote Desktop	No	Medium	⭐⭐ Good for work

Important: A normal HDMI cable usually won't work for this because laptop HDMI ports are generally output, not input.

If you tell me the exact laptop models of both laptops (e.g., Dell Latitude 5420 → Lenovo ThinkPad T14), I can tell you whether Miracast should work and the best way to use one as the second monitor.