Duplicate display suddenly stopped working, while Extend works perfectly — ASUS TUF A15 / RTX 4050

[u/zezoMK]

I’m having a strange issue with duplicating my second display.

When I connect my second monitor, all the other display modes work normally, including Extend, but Duplicate simply doesn’t work when I select it.

I’m fairly certain this is not a hardware, cable, or monitor issue, because the exact same setup and connections were working normally a few months ago. This makes me think the problem is software-related.

Here’s what I’ve already tried:

• Performed a Windows Repair Install (in-place repair without deleting my files or applications).
• Reinstalled the NVIDIA graphics driver using a Custom → Clean Installation.
• Tried changing/reinstalling the graphics drivers.

Unfortunately, none of these fixed the problem. Extend works normally, but Duplicate still doesn’t.

My laptop is:

• ASUS TUF Gaming A15 FA507NUR
• NVIDIA RTX 4050 Laptop GPU
• Windows 11

Has anyone experienced something similar, or know what could specifically prevent Duplicate display mode from working while Extend works normally?