三星LS32AG32X显示器通过USB-C转HDMI转接器连接笔记本时提示“Not optimum mode, recommended mode 1920x1080 144Hz”的问题求助

Hi there, let's work through this issue step by step based on what you've shared! First, let's recap the key details to make sure we're on the same page:

• Your Samsung LS32AG32X works perfectly when connected directly to your M1 Pro via HDMI
• The USB-C to HDMI dongle is functional (it works fine with your MSI Optix MAG342CQR)
• But when using this dongle with your M1 Air or Dell XPS, the monitor throws the "Not optimum mode" error recommending 1920x1080@144Hz

Here are some actionable solutions you can try:

1. Manually set your laptop's display output to match the monitor's recommended mode #

Since the monitor is explicitly asking for 1920x1080 at 144Hz, let's make sure your laptops are outputting this exact signal:

• For MacBook M1 Air:
  1. Open 系统设置 → 显示器
  2. Hold down the Option key and click 缩放 to reveal all available resolution options
  3. Select 1920x1080, then check if 144Hz is available in the refresh rate dropdown. If not, try 60Hz first to see if the error disappears—this will help us narrow down if the issue is with resolution or refresh rate support.
• For Dell XPS:
  1. Right-click your desktop → 显示设置
  2. Select the Samsung monitor from the display list, then click 高级显示设置
  3. Set the resolution to 1920x1080 and refresh rate to 144Hz, then save the changes.

2. Verify your dongle's HDMI version compatibility #

Even though the dongle works with your MSI monitor, different displays have varying HDMI version requirements. The Samsung LS32AG32X needs at least HDMI 1.4 to support 1920x1080@144Hz (HDMI 1.4 maxes out at 1080p@144Hz, while HDMI 2.0 supports higher resolutions). If your dongle is an older HDMI 1.2 model, it can only output 1080p@60Hz—which would trigger the "not optimum mode" error. Double-check the dongle's specs to confirm it's HDMI 1.4 or newer.

3. Update firmware and drivers #

Outdated software often causes compatibility issues:

• Samsung monitor: Visit Samsung's official website to download the latest firmware for your LS32AG32X model. Follow the update instructions carefully (don't disconnect power during the update!).
• Dell XPS: Open the Dell SupportAssist app to scan for and update your graphics drivers and USB-C related drivers.
• MacBook M1 Air: Go to 系统设置 → 通用 → 软件更新 to install the latest macOS version—Apple regularly fixes peripheral compatibility bugs in system updates.

4. Adjust monitor settings for better compatibility #

Try tweaking your Samsung monitor's internal settings:

• Press the physical menu button on the monitor, navigate to 输入源 and confirm you've selected the correct HDMI port.
• Look for settings like HDMI Mode, Game Mode, or Signal Compatibility—enabling these might help the monitor recognize the signal from your dongle more reliably, especially for high refresh rates.

5. Rule out physical connection issues #

Sometimes the simplest fixes work:

• Unplug and re-seat the dongle in both your laptop's USB-C port and the monitor's HDMI port, making sure they're firmly connected.
• Try a different USB-C port on your laptop (if available)—some ports might have limited bandwidth for high-refresh display output.
• If your dongle has an extra USB power port, plug it into a power source—some high-bandwidth display outputs require additional power to function correctly.

Hope one of these solutions gets your M1 Air and Dell XPS working with the Samsung monitor smoothly!

备注：内容来源于stack exchange，提问作者Noriode Raphael