As the title suggests, I’ve been dealing with this issue since I started using Linux as my main operating system. The only way I can achieve 240 Hz at 4K resolution in Linux on my Samsung G80SD monitor is by using a DP 1.4 cable, which introduces artifact flickering when selecting either 120 Hz or …

Hey there. Wow, months without a reply! I can confirm the same issue. Distro: Bazzite (nvidia-open) Kernel: 6.16.4 (and more bazzite custom) DE: KDE Plasma 6.4.5 The monitor is a Dell AlienWare 4K 240Hz. As soon as I set the Display Configuration to 240 Hz, most applications on the whole system…

Hello, Any updates on this? I’ve got the same problem on Samsung G80SD. Can set 240Hz but it feels like animations looks like 60 fps. Display is connected via HDMI 2.1 and in Windows it’s working fine. Distro: Fedora 43 Kernel: 6.17.10-300 nVidia driver: 590.44.01 (tried also stable release, bu…

Is “Input Signal Plus” an option under “External Device Manager” in your monitor settings?

Yes, and it is enabled. I can select 240Hz refresh rate and monitor says that it is 240Hz but it feels like it is 60Hz. Resolution doesn’t matter I checked that on 1440p, 1080p and same behaviour is when it is on 240Hz. Although 120Hz works fine.

You have the exact same issue as I do.

Same issue on 5080 + G80SD on Kernel: Linux 6.18.2-3-cachyos /lib/modules/6.18.2-3-cachyos/extramodules/nvidia.ko.zst firmware: nvidia/590.48.01/gsp_ga10x.bin firmware: nvidia/590.48.01/gsp_tu10x.bin

There’s definitely an issue with high refresh rates on the current drivers. My problem is similar but not quite the same. Refresh rate is fine at 240hz right up until my g93sc sleeps. After that the refresh rate drops to 60hz and is locked until I reboot the monitor or the computer. DisplayPort c…

Anyone else experiencing the same issue, or anyone from NVIDIA who has tried to reproduce it yet?

I can't reach 4K@240 Hz on my monitor via HDMI 2.1

Graphics / Linux Linux

fhortner March 1, 2026, 3:38pm 14

Looks like the same issue as this one:

@merkurio_92

Are you using an Nvidia Optimus based Laptop or a desktop computer?

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I can't reach 4K@240 Hz on my monitor via HDMI 2.1

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