A guide to fix the second monitor problem when using Samsung S90C TV in gaming mode

Question:

How to prevent second monitor from losing signal when turning off Samsung S90C TV in gaming mode?

I have a dual monitor setup with a 2k 60 Hz main monitor (DP) and a HD 60 Hz second monitor (HDMI). I also have a Samsung S90C TV (HDMI) that I use for gaming. When I set the TV to gaming mode and change the refresh rate to 120 or 144 Hz in Windows, everything works fine. However, when I turn off the TV, my second monitor goes black or loses signal. The only way to get it back is to unplug the HDMI cable from the TV. This does not happen when I use the 2k 60 Hz preset for the TV instead of the gaming mode. I suspect that there is some issue with the driver or Windows that messes up the refresh rate settings for the second monitor. I have tried reinstalling the driver using DDU, but it did not help. I am looking for a solution that allows me to use the higher refresh rates on the TV without affecting the second monitor. My GPU is an Asus ROG STRIX RTX3080 O10G WHITE V2.

Answer:

Many gamers enjoy using a Samsung S90C TV as their gaming display, thanks to its high refresh rate, low input lag, and curved screen. However, some users have reported a problem when they use the TV in gaming mode along with a dual monitor setup. When they turn off the TV, their second monitor loses signal or goes black, and they have to unplug and replug the HDMI cable from the TV to get it back. This is a frustrating and inconvenient issue that can ruin the gaming experience. In this article, we will explain why this happens and how to fix it.

Why does the second monitor lose signal when turning off the TV in gaming mode?

The root cause of this problem is the way Windows handles the display settings when the TV is in gaming mode. When you set the TV to gaming mode and change the refresh rate to 120 or 144 Hz in Windows, you are actually creating a custom resolution for the TV. This custom resolution is not recognized by Windows as a standard resolution, and it is not compatible with the second monitor, which has a different resolution and refresh rate. When you turn off the TV, Windows tries to adjust the display settings to match the remaining monitors, but it fails to do so because of the custom resolution. As a result, the second monitor loses signal or goes black, and it does not show up in the Nvidia control panel or the Windows display settings.

How to fix the second monitor losing signal when turning off the TV in gaming mode?

There are two possible solutions to this problem. The first one is to use the 2k 60 Hz preset for the TV instead of the gaming mode. This preset is a standard resolution that is compatible with the second monitor, and it does not cause any issues when you turn off the TV. However, this means that you will not be able to use the higher refresh rates on the TV, which may affect your gaming performance and enjoyment.

The second solution is to use a third-party software called Custom Resolution Utility (CRU). This software allows you to create and edit custom resolutions for your displays, and it can override the Windows display settings. With CRU, you can create a custom resolution for the TV that matches the gaming mode, but also make it compatible with the second monitor. This way, you can use the higher refresh rates on the TV without affecting the second monitor. Here are the steps to use CRU:

1. Download and install CRU from [here](https://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU).

2. Run CRU and select your TV from the list of displays. Click on “Edit” next to the “Detailed resolutions” box.

3. In the “Timing” tab, select “Manual” and enter the same values as the gaming mode. For example, if you want to use 144 Hz, enter 2560 for horizontal active pixels, 1440 for vertical active pixels, 312 for horizontal front porch, 32 for horizontal sync width, 3 for vertical front porch, 5 for vertical sync width, 241500 for pixel clock, and check the “Interlace” box. Click on “OK”.

4. Click on “Add” next to the “Standard resolutions” box. In the “Standard resolutions” window, select “User defined” and enter the same values as the second monitor. For example, if your second monitor is 1920×1080 at 60 Hz, enter 1920 for horizontal active pixels, 1080 for vertical active pixels, and 60 for refresh rate. Click on “OK”.

5. Click on “OK” to close CRU and restart your computer.

6. After restarting, go to the Nvidia control panel and select your TV from the list of displays. You should see the custom resolution that you created with CRU in the “PC” section. Select it and apply the changes.

7. You should now be able to use the higher refresh rates on the TV without affecting the second monitor. You can also turn off the TV and the second monitor should stay on.

Conclusion

The Samsung S90C TV is a great gaming display, but it can cause some problems when used in gaming mode with a dual monitor setup. The second monitor may lose signal or go black when you turn off the TV, due to the custom resolution that is not compatible with the second monitor. To fix this, you can either use the 2k 60 Hz preset for the TV, or use CRU to create a custom resolution that is compatible with the second monitor. We hope this article helped you solve this issue and enjoy your gaming experience.

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