According to Phoronix, the Mesa 23.3 version includes new code for supporting GFX11.5 with the RadeonSI Gallium3D driver

To provide some background, the GFX11 support has been enabled in the most recent version of the Linux Mesa 3D graphics library

An increase of 0.5 in the version number of the GFX11 library indicates that a very minor graphics update for RDNA 3 is on its way

Phoronix on Mesa’s GFX11.5 support said that the most likely reason for the driver modification was to prepare for the launch of the Ryzen 8000 ‘Strix Point’ series APUs

It’s possible that these new APUs have RDNA 3.5 architecture with somewhat modified RDNA 3 GPUs incorporated

In conclusion, it seems as though the Mesa 23.3 version for Linux provides support for some new AMD GPU or another.

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