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Cannot disable VSync in Editor (vulkan mode)

Hello! When I start UE4 editor in OpenGL4 mode (UE4Editor -opengl4) I get 120 FPS but when I start it in Vulkan mode (UE4Editor w/o any additional parameters) my FPS gets locked on 75.

Tried inputting these console commands, got no result: t.MaxFPS 150; r.VSync 0; r.VSyncEditor 0.

Distro: Pop!_OS 18.10 (Ubuntu 18.10 derivative); NVIDIA drivers: 418.43.

Product Version: UE 4.21
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asked Mar 08 '19 at 10:33 PM in Linux

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Pass -vulkanpresentmode=0 when starting the editor. This will force VulkanRHI to use VK_PRESENT_MODE_IMMEDIATE_KHR.

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answered Mar 11 '19 at 06:05 AM

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avatar image Esbouu Mar 11 '19 at 05:59 PM

Thank you, it works! Even though fps in editor in Vulkan mode is significantly lower than in OpenGL4.

avatar image Dean R. Anderson Apr 10 '19 at 05:55 PM

Glad I'm not the only one experiencing this. Even on the default template projects Vulkan is maxing out at ~76 fps vs 120 fps in OpenGL.

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