Mesa 22.0 Intel OpenGL/Vulkan Drivers Enable Adaptive-Sync/VRR
For a year has been the Mesa merge request to go ahead and enable Adaptive-Sync for their "Iris" Gallium3D OpenGL and "ANV" Vulkan open-source drivers on Linux. The changes are trivial with just toggling the DRI_CONF_ADAPTIVE_SYNC option for Mesa's integration around the DRM Variable Refresh Rate API.... That Mesa DRM VRR API integration was previously tackled by AMD developers working on their VRR/FreeSync/Adaptive-Sync support years ago. All of the vendor-specific magic happens within the kernel drivers around this feature for reducing tearing and stuttering within games.
See the VESA whitepaper in the event you are not familiar with Adaptive-Sync.
As of today in Mesa 22.0-devel those Intel OpenGL/Vulkan driver patches have landed for enabling Adaptive-Sync. Mesa 22.0 will debut as stable later this quarter with these bits in place assuming you are running a recent kernel release (or Linux 5.17+ for Ice Lake).