Dota 2: Black screen on Linux

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Dota 2 won’t start on Linux

One thing that worked for me —which also improved the game performance— was switching to OpenGL from Vulkan by passing -gl to the Launch Options.

You can also try forcing Vulkan if OpenGL doesn’t work for you by passing -vulkan instead.

Reference

• Dota 2 - Steam/Game-specific troubleshooting