Dota 2: Black screen on Linux

Dota 2 won't start#

One thing that worked for me ---which also improved the game performance--- was to switch from Vulkan to OpenGL 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