The "Not Optimum Mode" warning on the Samsung LS32AG32X indicates that your source device is sending a resolution or refresh rate outside the monitor's optimal specifications. To resolve this, you must manually configure your operating system to output exactly 1920x1080 at 144Hz. This ensures the panel operates within its designed parameters for peak image quality and performance.
Understanding the Error Message
When your Samsung LS32AG32X displays the message "Not Optimum Mode, Recommended Mode 1920x1080 144Hz," it is communicating that the current signal does not match the display's native capabilities. The LS32AG32X is a 32-inch gaming monitor with a native Full HD resolution. While it can accept various input signals, the manufacturer specifies 1920x1080 at 144Hz as the ideal setting for the best visual experience.
This error typically appears when the connected computer sends a higher refresh rate than the monitor supports at that resolution, such as attempting 144Hz at a custom resolution, or a lower refresh rate like 60Hz when the user expects high-speed gaming performance. It can also occur if the resolution itself is non-standard, such as 1600x900 or an upscaled 4K signal being downconverted improperly. The monitor’s internal scaler is working, but it is warning you that you are not utilizing the hardware at its full potential.
Configuring Windows Display Settings
If you are using a Windows PC, the most common cause of this issue is incorrect configuration in the display settings. You need to navigate to the advanced display options to force the correct output.
- Open Display Settings: Right-click on an empty area of your desktop and select
Display settingsfrom the context menu. - Select the Monitor: If you have multiple screens, scroll down to the "Multiple displays" section and click on the rectangle representing your Samsung monitor (usually labeled as Display 2). Ensure it is identified correctly by clicking the
Detectbutton if necessary. - Access Advanced Properties: Scroll further down to the "Scale and layout" section. Click on the link that says
Advanced display. This opens a new window with more granular control over refresh rates. - Set Resolution: In the "Display adapter properties for Display X" window, look for the "Resolution" dropdown. Select
1920 x 1080. Do not select any other value, even if it seems to work visually. - Set Refresh Rate: Below the resolution option, find the "Choose a refresh rate" dropdown. Change this to
144 Hz. If 144Hz is not listed, your cable or port may be limiting the bandwidth, which we will address later. - Apply Changes: Click
Apply. The screen may flicker briefly. If the image remains stable and the error message disappears, the configuration is successful.
If you previously had a second monitor connected via HDMI while using USB-C, refer to our guide on connecting a second monitor with HDMI on a USB-C laptop to ensure your graphics card drivers are handling multi-display outputs correctly without conflicting with the primary signal path.
Configuring macOS Display Settings
Mac users often encounter this issue because macOS defaults to a scaled resolution that mimics 4K sharpness, which can sometimes trigger compatibility warnings on high-refresh-rate monitors. Additionally, macOS has historically had limited support for 144Hz over HDMI depending on the GPU generation.
- Open System Settings: Click the Apple menu and select
System Settings(orSystem Preferenceson older versions). - Navigate to Displays: Select
Displaysfrom the sidebar. Identify your Samsung LS32AG32X in the list of connected screens. - Select Resolution: Click on the
Show MoreorAdvancedbutton to reveal all available resolutions. Look for1920 x 1080. Avoid selecting "Scaled" options that say "Looks like 1080p" but use different timing; stick to the native digital resolution. - Check Refresh Rate: On some Mac configurations, the refresh rate is tied to the resolution selection. If you do not see 144Hz, try selecting
HiDPImodes or check if your specific Mac model supports 144Hz over HDMI. Many Intel-based Macs only support up to 60Hz or 120Hz over standard HDMI ports. For true 144Hz, you may need to use a USB-C to DisplayPort connection instead of HDMI. - Confirm Output: Once selected, close the settings window. The monitor should update immediately.
Cable and Port Verification
If you have set the resolution to 1920x1080 and the refresh rate to 144Hz, but the error persists or the signal drops, the physical connection is likely the bottleneck. The LS32AG32X requires sufficient bandwidth to transmit 144 frames per second at Full HD.
Ensure you are using a High-Speed HDMI cable that is certified for HDMI 2.0 or higher. Older HDMI 1.4 cables may struggle to maintain 144Hz stability, causing the monitor to revert to a safer, lower mode. Inspect both ends of the cable for damage. Try plugging the cable into a different HDMI port on your computer or the monitor, as some ports may be wired differently (e.g., one might be USB-C alt-mode while another is pure HDMI).
If you are connecting a gaming laptop, verify that your dedicated GPU is driving the external display. Sometimes laptops default to the integrated graphics for power saving, which may not support the required refresh rates. Refer to connecting a gaming monitor to a laptop for 144Hz for detailed steps on ensuring your GPU is actively managing the high-bandwidth output.
Driver Updates and Firmware
Outdated graphics drivers can cause the operating system to misreport the monitor's Extended Display Identification Data (EDID). This leads to the OS offering incorrect refresh rates or resolutions. Update your NVIDIA, AMD, or Intel graphics drivers to the latest version from the manufacturer's website. For Samsung monitors, check the official Samsung support page for any firmware updates for the LS32AG32X, although this is less common than driver issues.
Frequently Asked Questions
Why does my monitor show 144Hz but still give a warning?
The warning specifically mentions the resolution alongside the refresh rate. Even if you have set 144Hz, if the resolution is not exactly 1920x1080, the monitor will flag it as suboptimal. Ensure you are not using a "scaled" resolution that approximates 1080p but uses different pixel mapping.
Can I use a DisplayPort cable instead of HDMI?
Yes, using a DisplayPort cable is often more reliable for achieving 144Hz on laptops, especially those with older HDMI ports. DisplayPort 1.2 or higher easily handles 1920x1080 at 144Hz without the bandwidth constraints sometimes seen in HDMI implementations on compact devices.
What if 144Hz is not an option in my settings?
If 144Hz is missing, your cable may be too old, or your computer's video output port may not support that bandwidth. Try a certified High-Speed HDMI cable or switch to a DisplayPort connection. Some integrated graphics solutions simply do not support 144Hz output over their available ports.
Does this error damage my monitor?
No, the "Not Optimum Mode" warning is purely informational and will not damage your display. The monitor is simply informing you that it is scaling the image or running below its peak specification. However, prolonged use of non-optimal modes may result in slightly reduced image clarity or responsiveness.
How do I reset the monitor to factory settings?
If settings are corrupted, you can reset the OSD (On-Screen Display) by pressing the joystick button on the back of the monitor. Navigate to Self Diagnosis or Setup and select Reset. This restores the monitor's internal preferences, though it will not change the signal sent by your computer.