Vulkan
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Vulkan is a low-overhead, cross-platform API, open standard for 3D graphics and computing developed by Khronos Group, a successor to OpenGL.
Most games will usually have Vulkan disabled by default for compatibility reasons, except in 
Portal with RTX which is enabled by default.
Games that supports Vulkan:
Half-Life 2 (added since 2022 
Steam Deck update)
Portal (same as HL2 case)
- Portal with RTX (enabled by default)
Left 4 Dead 2 (since the June 15, 2021 update)
Portal 2
Counter-Strike: Global Offensive (Linux only)
Dota 2
Artifact
Half-Life: Alyx (since version 1.3, released in May 16, 2020)