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 (with older GPUs) or possibly to avoiding bugs or performance issues that sometime may happen even on high-end hardware, 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)
Counter-Strike 2
Dota 2
Artifact
Aperture Desk Job
Half-Life: Alyx (since version 1.3, released in May 16, 2020)
Note:Vulkan is enable by the launch option -vulkan, or by using -gamepadui in all Half-Life 2 games and Portal.