Duplicate screen option not working when connecting hdmi

Duplicate screen is not working when connecting hdmi

jay4upeople said:

Duplicate screen is not working when connecting hdmi

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Could you please provide more information such as:

What exactly is happening when you connect a monitor via HDMI. Does Windows detect the monitor at all but you simply cannot extend the screen to it? Is this a laptop where the HDMI monitor is a second screen or is this a desktop that already has one monitor connected? What is the exact make and model of the PC or if home built, please provide motherboard and GPU details. What troubleshooting have you already done so that we don't suggest things you have already tried? Include any other details that may help us understand your setup and what you are trying to accomplish.

Welcome to the forum.
Suggestions to try courtesy of co-pilot. Hope one works for you.

1. Unplug HDMI → reboot → plug HDMI back in → set both displays to the same resolution + refresh rate → try Duplicate again.

2. Before selecting Duplicate:

1. Right-click desktop → Display settings
2. Select each display → Advanced display settings
3. Set both to: 1920×1080 @ 60 Hz (the most universally supported mode)
   
   Then try Duplicate again.

3. If one display is 4K and the other is 1080p, Windows sometimes refuses to clone until you manually downscale the 4K display first.
Then try Duplicate again.

4. Depending on your GPU:
NVIDIA

• Open NVIDIA Control Panel
• Go to Set up multiple displays
• Try enabling Clone there instead of Windows Settings.

AMD​

• Open AMD Software
• Go to Display → Eyefinity / Clone

Intel​

• Open Intel Graphics Command Center
• Go to Display → Multiple Displays → Clone

Sometimes the GPU driver handles cloning better than Windows.

5. Update or reinstall display drivers

6. From command prompt as admin type: displayswitch.exe /clone
If it errors or does nothing, Windows is failing the clone negotiation.

7. You can also reset display data:

1. disconnect HDMI
2. Shut down PC completely
3. Unplug power from monitor/TV for 30 seconds
4. Reconnect everything
5. Try Duplicate again

This forces a fresh EDID handshake.

Symptoms of EDID failure:

• Monitor shows “No signal” when switching to Duplicate
• Windows flashes and returns to Extend mode
• Resolution options disappear

Fixes:

• Try a different HDMI cable
• Try a shorter cable
• Remove HDMI splitters, adapters, docks
• Update monitor firmware (if available)

TVs often cause duplicate-mode issues because:

• They report unusual refresh rates (59.94 Hz)
• They use overscan modes
• They sometimes only support certain PC resolutions

Try: Set TV to PC mode or Game mode

• Disable overscan (“Just Scan”, “1:1”, “Full Pixel”)
• Force 1080p @ 60 Hz

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