What to do if the Xiaomi 4K Monitor A27Ui cannot select the optimal resolution?

If your Xiaomi 4K Monitor A27Ui cannot select the optimal resolution, please try the following steps:
  1. Check the graphics driver:
Ensure your graphics card driver is up to date. Visit the official website of your graphics card manufacturer to download and install the latest driver that matches your graphics card model and operating system. For example, if you are using an NVIDIA graphics card, visit the NVIDIA website; for AMD graphics cards, visit the AMD website;
  1. Confirm the connection method:
Check the cable connecting your monitor and computer. For 4K resolution, it is recommended to use HDMI 2.0 or above, or DisplayPort 1.4 or above. Using older or lower-spec cables can prevent the monitor from supporting 4K at 60 Hz;
  1. Check operating system settings:
(1). On Windows, right-click on the desktop and select [Display Settings]. Under the [Resolution] option, check if 4K 60 Hz is available. If not, click on [Advanced display settings] to see more resolution options;
(2). On macOS, click the Apple menu, select [System Preferences], then click [Displays] to view available resolution settings;
  1. Check the monitor settings:
Some monitors can require manual configuration to display the optimal resolution. Open the monitor’s OSD menu and look for settings related to resolution or display mode. Ensure it is set to Auto or 4K 60 Hz.
  1. Try a different port:
If both your computer and monitor support multiple ports (such as HDMI and DP), try switching to a different one to see if it resolves the issue.
  1. Restart the computer and monitor:
In some cases, a simple restart can fix temporary display issues.

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