CachyOS/proton-cachyos cachyos-10.0-20250807-slr

Version 10.0-20250807

on GitHub

• Proton (SLR and Native)

  • Added downloader for XeSS dlls (version 2.1.0), similar to the DLSS downloader. Use PROTON_XESS_UPGRADE=1 environment variable to enable it.

  • Added PROTON_FSR4_RDNA3_UPGRADE for RDNA3 GPUs. Does the same thing as PROTON_FSR4_UPGRADE but also sets some other necessary variables.

  • Added completer implementations of Nvidia libraries missing from Proton. Should help with enabling options such as PhysX on games they were disabled before. These Nvidia libraries were integrated from https://github.com/SveSop/nvidia-libs. To enable them use PROTON_NVIDIA_LIBS=1. You can also enable them individually using PROTON_NVIDIA_NVCUDA, PROTON_NVIDIA_NVENC, PROTON_NVIDIA_NVML and PROTON_NVIDIA_NVOPTIX. These are incompatible with wow64 and thus disabled when PROTON_USE_WOW64=1 is set.

    Important: If you are using RTX series 4000 or 5000 GPUs you might encounter bad performance or crashes when enabling these with 32bit games. UsePROTON_NVIDIA_LIBS_NO_32BIT=1 with any of the options above to disable the 32bit and use the 64bit libraries only. Some 32bit games on RTX 4000 and above might still exhibit bad performance with these libraries enabled, e.g. Mirror's Edge.

    Note: It is advised that you report issues with these libraries in their respective issue trackers, nvcuda, nvenc, wine-nvml and wine-nvoptix. If you don't know what is causing the problem, feel free to open an issue in proton-cachyos instead.

  • Added per-game shader cache, enabled by default, can be disabled with PROTON_LOCAL_SHADER_CACHE=0. Shaders will be cached under <steamlibrary>/shadercache/<appid> for each game, similarly to when shader pre-caching is enabled. You will get stuttering as the shader cache for each game is rebuilt but the cached shaders won't be evicted due to limited cache size.

  • Ensured that the codecs in FFmpeg match what Valve has enabled in theirs. We still enable more but now we should not miss any by chance.

  • Disabled codecalpha from gst-bad which was causing issues with some games with WebM videos when Wine is built with FFmpeg, and re-enabled winedmo.

  • Imported wayland related commits from Proton-EM (up to EM-10.0-2B).

  • Imported a few upstream commits.

  • Fix protonfixes not de-symlinking prefix files properly. Should fix issues with installing some winetricks verbs.

  • Updated protonfixes to Open-Wine-Components/umu-protonfixes@5cdfd36

• Proton (SLR specific)
  • None
• Proton (Native specific)
  • None

Note: There is a testing version with NTSync available here:

• https://share.cachyos.org/proton/proton-cachyos-10.0-20250807-slr-ntsync-x86_64.tar.xz
• https://share.cachyos.org/proton/proton-cachyos-10.0-20250807-slr-ntsync-x86_64_v3.tar.xz

To use NTSync you have to set PROTON_USE_NTSYNC=1. Do not trust mangohud's indicator, it falsely reports that it is using NTSync without this
environment variable while in reality it's using FSync/ESync. Verify with lsof /dev/ntsync. We want to be certain it doesn't cause regressions
hence we are not including it with in the main packages. This is not the same patchset as in Proton-GE/Proton-EM, it's compatibility might differ.

Note: For wayland specific flags and options, please refer to: https://github.com/Etaash-mathamsetty/Proton/blob/em-10/docs/EM-ADDITIONS.md

Base: https://github.com/ValveSoftware/Proton/tree/experimental-bleeding-edge-10.0-228005-20250807-p29548f-w253fb0-d835e98c-vb72e62