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Amazon.com: DTECH 4K HDMI Dummy Plug Display Emulator Headless Ghost Adapter Compatible with Windows Mac OSX Linux Support 4kx2k 2160P 1080p for Computer Desktop (fit-Headless, 1 Pack) : Electronics
Why did my monitor suddenly downgrade resolution? It used to be 1920x1080 but now it's stuck on 1024x768 and I have no option to set it back. - Quora
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