All 103 environment variables across variants. Amber highlights indicate a unique env var for that Proton variant.

Env VarProton (Valve)Proton CachyOSProton EMProton GE CustomDWProtonProton GE RTSP
COPYPREFIX ———bool——
DXVK_HDR —bool————
DXVK_NO_HDR —bool————
DXVK_NVAPI_VKREFLEX —bool————
GST_GL_WINDOW —unknown————
HOST_LC_ALL unknownunknown—unknownunknown—
LICENSE path———path—
LOW_LATENCY_LAYER —bool—bool——
PIPEWIRE_LATENCY —unknown————
PROTON_CRASH_REPORT_DIR pathpath——path—
PROTON_D7VK_DDRAW —bool————
PROTON_DEBUG_DIR ———path—path
PROTON_DISABLE_NVAPI boolbool——bool—
PROTON_DISCORD_BRIDGE —bool————
PROTON_DLSS_INDICATOR —bool—bool——
PROTON_DLSS_UPGRADE —bool—bool——
PROTON_DUMP_DEBUG_COMMANDS ———bool—bool
PROTON_DXVK_D3D8 boolbool——bool—
PROTON_DXVK_LOWLATENCY —bool————
PROTON_DXVK_SAREK —bool————
PROTON_ENABLE_HDR —bool————
PROTON_ENABLE_MEDIACONV —bool—bool——
PROTON_ENABLE_NVAPI ———bool—bool
PROTON_ENABLE_WAYLAND —bool————
PROTON_FFX3_UPGRADE —bool————
PROTON_FFX4_UPGRADE —bool————
PROTON_FORCE_LARGE_ADDRESS_AWARE boolbool—boolboolbool
PROTON_FSR3_UPGRADE ———bool——
PROTON_FSR4_INDICATOR —bool—bool——
PROTON_FSR4_RDNA3_UPGRADE ———bool——
PROTON_FSR4_UPGRADE —bool—bool——
PROTON_GST_VIDEO_ORIENTATION —bool————
PROTON_HEAP_DELAY_FREE boolbool—boolboolbool
PROTON_HIDE_NVIDIA_GPU boolbool——bool—
PROTON_LOCAL_SHADER_CACHE —bool————
PROTON_LOG boolbool—boolboolbool
PROTON_LOG_DIR pathpath——path—
PROTON_MEDIA_FORCE_GST —bool————
PROTON_MEDIA_USE_GST —bool————
PROTON_MLFG_UPGRADE —bool————
PROTON_NO_D3D10 boolbool—boolboolbool
PROTON_NO_D3D11 boolbool—boolboolbool
PROTON_NO_D3D12 ———bool—bool
PROTON_NO_D3D9 ———bool—bool
PROTON_NO_ESYNC bool——boolboolbool
PROTON_NO_FSYNC boolbool—boolboolbool
PROTON_NO_NTSYNC bool——boolbool—
PROTON_NO_STEAMINPUT —bool————
PROTON_NO_WM_DECORATION —bool————
PROTON_NO_WRITE_WATCH ———bool—bool
PROTON_NO_XIM —————bool
PROTON_NVIDIA_LIBS —bool————
PROTON_NVIDIA_LIBS_NO_32BIT —bool————
PROTON_NVIDIA_NVCUDA —bool————
PROTON_NVIDIA_NVENC —bool————
PROTON_NVIDIA_NVML —bool————
PROTON_NVIDIA_NVOPTIX —bool————
PROTON_OLD_GL_STRING boolbool—boolboolbool
PROTON_OPTISCALER_CONFIG —bool————
PROTON_OPTISCALER_NAME —bool————
PROTON_PREFER_SDL —bool————
PROTON_SET_GAME_DRIVE boolbool——bool—
PROTON_SONY_AUTO_XINPUT ———bool——
PROTON_SONY_DUALSENSE_AS_DUALSHOCK4 ———path——
PROTON_SONY_DUALSENSE_EDGE_AS_DUALSENSE ———bool——
PROTON_SONY_DUALSHOCK4_V2_AS_V1 ———bool——
PROTON_SONY_HIDRAW_XINPUT ———bool——
PROTON_STEAMINPUT_FALLBACK ———bool——
PROTON_STEAMINPUT_LAYOUT_DS4 ———path——
PROTON_STEAMINPUT_LAYOUT_DS5 ———path——
PROTON_STEAMINPUT_LAYOUT_XBOX ———path——
PROTON_USE_D9VK boolbool——bool—
PROTON_USE_OPTISCALER —bool————
PROTON_USE_PIPEWIRE —bool————
PROTON_USE_SDL —bool—bool——
PROTON_USE_SECCOMP boolbool—boolboolbool
PROTON_USE_WAYLAND —bool—bool——
PROTON_USE_WINED3D boolbool—boolboolbool
PROTON_USE_WOW64 ———bool——
PROTON_USE_X11_EXCLUSIVE ———path——
PROTON_USE_XALIA boolbool—boolbool—
PROTON_VKD3D_HEAP —bool————
PROTON_VKD3D_LOWLATENCY —bool————
PROTON_VKREFLEX —bool————
PROTON_WAIT_ATTACH boolbool——bool—
PROTON_XESS_UPGRADE —bool—bool——
STEAM_COMPAT_CONFIG pathpath——path—
VKD3D_CONFIG unknownunknown——unknown—
WAYLANDDRV_PRIMARY_MONITOR ——unknownunknown——
WAYLANDDRV_RAWINPUT ———bool——
WINEALSA_CHANNELS —bool————
WINEALSA_SPATIAL —bool————
WINEPULSE_FAST_POLLING —bool————
WINE_AUDIO_DRIVER —enum————
WINE_BLOCK_HOSTS —int————
WINE_DISABLE_EXE_ASLR ———bool——
WINE_DISABLE_VULKAN_OPWR boolbool——bool—
WINE_DO_NOT_CREATE_DXGI_DEVICE_MANAGER boolbool—boolboolbool
WINE_FULLSCREEN_FSR ———bool—bool
WINE_FULLSCREEN_FSR_CUSTOM_MODE ———unknown—unknown
WINE_FULLSCREEN_FSR_STRENGTH ———unknown—unknown
WINE_FULLSCREEN_INTEGER_SCALING boolbool——bool—
WINE_USE_KWIN_HACKS boolbool——bool—

Unique per variant

  • Proton (Valve): none
  • Proton CachyOS: DXVK_HDR, DXVK_NO_HDR, DXVK_NVAPI_VKREFLEX, GST_GL_WINDOW, PIPEWIRE_LATENCY, PROTON_D7VK_DDRAW, PROTON_DISCORD_BRIDGE, PROTON_DXVK_LOWLATENCY, PROTON_DXVK_SAREK, PROTON_ENABLE_HDR, PROTON_ENABLE_WAYLAND, PROTON_FFX3_UPGRADE, PROTON_FFX4_UPGRADE, PROTON_GST_VIDEO_ORIENTATION, PROTON_LOCAL_SHADER_CACHE, PROTON_MEDIA_FORCE_GST, PROTON_MEDIA_USE_GST, PROTON_MLFG_UPGRADE, PROTON_NO_STEAMINPUT, PROTON_NO_WM_DECORATION, PROTON_NVIDIA_LIBS, PROTON_NVIDIA_LIBS_NO_32BIT, PROTON_NVIDIA_NVCUDA, PROTON_NVIDIA_NVENC, PROTON_NVIDIA_NVML, PROTON_NVIDIA_NVOPTIX, PROTON_OPTISCALER_CONFIG, PROTON_OPTISCALER_NAME, PROTON_PREFER_SDL, PROTON_USE_OPTISCALER, PROTON_USE_PIPEWIRE, PROTON_VKD3D_HEAP, PROTON_VKD3D_LOWLATENCY, PROTON_VKREFLEX, WINE_AUDIO_DRIVER, WINE_BLOCK_HOSTS, WINEALSA_CHANNELS, WINEALSA_SPATIAL, WINEPULSE_FAST_POLLING
  • Proton EM: none
  • Proton GE Custom: COPYPREFIX, PROTON_FSR3_UPGRADE, PROTON_FSR4_RDNA3_UPGRADE, PROTON_SONY_AUTO_XINPUT, PROTON_SONY_DUALSENSE_AS_DUALSHOCK4, PROTON_SONY_DUALSENSE_EDGE_AS_DUALSENSE, PROTON_SONY_DUALSHOCK4_V2_AS_V1, PROTON_SONY_HIDRAW_XINPUT, PROTON_STEAMINPUT_FALLBACK, PROTON_STEAMINPUT_LAYOUT_DS4, PROTON_STEAMINPUT_LAYOUT_DS5, PROTON_STEAMINPUT_LAYOUT_XBOX, PROTON_USE_WOW64, PROTON_USE_X11_EXCLUSIVE, WAYLANDDRV_RAWINPUT, WINE_DISABLE_EXE_ASLR
  • DWProton: none
  • Proton GE RTSP: PROTON_NO_XIM
Proton Variants v0.6.2 | GitHub