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Hello there! We understand your inquiry and are happy to help with your LG UltraGear 27GS75Q‑B.AUS gaming monitor. This model includes two HDMI® ports, which support HDMI 2.0 standards rather than HDMI 2.1. While HDMI 2.1 isn’t available on this unit, you can still enjoy outstanding performance with your Xbox Series X at up to 1440p resolution and refresh rates up to 120 Hz. As a quick troubleshooting step, please ensure your Xbox Series X is set to output the optimal resolution and variable refresh rate (VRR) for this monitor: on your console, go to Settings > General > TV & display options, select 1440p, and enable Allow variable refresh rate. This will help you achieve the smoothest gameplay experience possible on the 27GS75Q‑B.AUS. https://www.bestbuy.com/site/lg-ultragear-27-ips-led-180hz-1-ms-nvidia-g-sync-compatible-and-amd-freesync-gaming-monitor-with-hdr-black/6575404.p?skuId=6575404 If you’d like further assistance—such as firmware updates, calibration tips, or exploring additional settings—please send us a private message on social media @LGUSSupport and our team will be more than happy to explore solutions with you. We appreciate your patience and look forward to helping you get the most out of your new UltraGear monitor! —Renzo
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