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steam_linux_launch_args/launch_args_env_vars.md
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Launch Args & Env Vars Reference

Gamescope

Launch: gamescope [options] -- %command%

Arg Description
-W <width> Output window width
-H <height> Output window height
-w <width> Game viewport width
-h <height> Game viewport height
-S integer Integer scaling
-S stretch Stretch to fill window
-b Borderless window
-f Fullscreen window
-r <fps> Frame rate limit
-o <fps> Frame rate limit unfocused
-F fsr FSR upscaling
-F nis NVIDIA Image Scaling
--reshade-effect <path> Reshade effect
--reshade-technique-idx <idx> Reshade technique index

Env vars: none (passes through to child)

Proton (Valve Official)

Launch:

STEAM_COMPAT_CLIENT_INSTALL_PATH="$HOME/.local/share/Steam" \
STEAM_COMPAT_DATA_PATH="$HOME/.steam/steam/steamapps/compatdata/$APPID" \
~/.steam/steam/steamapps/common/Proton\ $VERSION/proton \
waitforexitandrun %command%

Core env vars (set by Steam):

Variable Description
STEAM_COMPAT_CLIENT_INSTALL_PATH Steam install path
STEAM_COMPAT_DATA_PATH Game compatdata path
STEAM_COMPAT_APP_ID Game AppID
STEAM_COMPAT_INSTALL_PATH Game install path
STEAM_COMPAT_TOOL_PATHS Colon-separated Proton tool paths
STEAM_COMPAT_USER_CONFIG_PATH Per-game config override path
STEAM_RUNTIME 1 to enable Steam Runtime
STEAM_RUNTIME_DIR Steam Runtime path
STEAM_RUNTIME_LIBRARY_PATH Steam Runtime library path
WINEPREFIX Wine prefix path
WINEARCH Wine arch (win64 or win32)
WINEDEBUG Wine debug string
DISPLAY Display server (:0)
XDG_SESSION_TYPE x11 or wayland

Proton launch option env vars:

Compat config string Env var Description
PROTON_LOG Debug log to $HOME/steam-$APPID.log
PROTON_WAIT_ATTACH Wait for debugger
PROTON_CRASH_REPORT_DIR Crash log dir
wined3d PROTON_USE_WINED3D OpenGL wined3d for d3d11/d3d10
nod3d12 PROTON_NO_D3D12 Disable DX12
nod3d11 PROTON_NO_D3D11 Disable DX11
nod3d10 PROTON_NO_D3D10 Disable DX10
nod3d9 PROTON_NO_D3D9 Disable DX9
noesync PROTON_NO_ESYNC Disable eventfd sync
nofsync PROTON_NO_FSYNC Disable futex sync
nontsync PROTON_NO_NTSYNC Disable ntsync module
forcelgadd PROTON_FORCE_LARGE_ADDRESS_AWARE Force LARGE_ADDRESS_AWARE
heapdelayfree PROTON_HEAP_DELAY_FREE Delay memory freeing
enablenvapi PROTON_ENABLE_NVAPI Enable NVIDIA NVAPI
seccomp PROTON_USE_SECCOMP Enable seccomp-bpf
nowritewatch PROTON_NO_WRITE_WATCH Disable write watches
oldglstr PROTON_OLD_GL_STRING Limit GL extension string
xalia PROTON_USE_XALIA Enable Xalia
noxalia PROTON_USE_XALIA=0 Disable Xalia
cmdlineappend: (none) Append as game command arg (repeatable)

Proton-GE

Launch: Same as Valve Proton, binary in ~/.steam/steam/compatibilitytools.d/GE-Proton-X.X/

Proton launch option env vars:

Compat config string Env var Description
PROTON_LOG Debug log
PROTON_DUMP_DEBUG_COMMANDS Debug scripts to $PROTON_DEBUG_DIR/proton_$USER/
PROTON_DEBUG_DIR Debug script root (default: /tmp)
wined3d PROTON_USE_WINED3D OpenGL wined3d for d3d11/d3d10
nod3d12 PROTON_NO_D3D12 Disable DX12
nod3d11 PROTON_NO_D3D11 Disable DX11
nod3d10 PROTON_NO_D3D10 Disable DX10
nod3d9 PROTON_NO_D3D9 Disable DX9
noesync PROTON_NO_ESYNC Disable eventfd sync
nofsync PROTON_NO_FSYNC Disable futex sync
nontsync PROTON_NO_NTSYNC Disable ntsync module
forcelgadd PROTON_FORCE_LARGE_ADDRESS_AWARE Force LARGE_ADDRESS_AWARE
heapdelayfree PROTON_HEAP_DELAY_FREE Delay memory freeing
HOST_LC_ALL Override system locale
enablenvapi PROTON_ENABLE_NVAPI Enable NVIDIA NVAPI
oldglstr PROTON_OLD_GL_STRING Limit GL extension string
cmdlineappend: (none) Append as game command arg
xalia PROTON_USE_XALIA Enable Xalia
noxalia PROTON_USE_XALIA=0 Disable Xalia
seccomp PROTON_USE_SECCOMP Enable seccomp-bpf
nowritewatch PROTON_NO_WRITE_WATCH Disable write watches
WINE_FULLSCREEN_FSR Enable FSR (Vulkan only)
WINE_FULLSCREEN_FSR_STRENGTH FSR sharpening (0-5, default 2)
WINE_FULLSCREEN_FSR_CUSTOM_MODE Fake resolution WIDTHxHEIGHT
WINE_DO_NOT_CREATE_DXGI_DEVICE_MANAGER Fix miscolored video
COPYPREFIX Copy prefix/shader cache if -steamdeck
fsr4 PROTON_FSR4_UPGRADE Auto-download FSR 4 DLL
fsr4hud PROTON_FSR4_INDICATOR FSR4 watermark
fsr4rdna3 PROTON_FSR4_RDNA3_UPGRADE FSR4 for RDNA3 GPUs
fsr3 PROTON_FSR3_UPGRADE Auto-download FSR 3 DLL
dlss PROTON_DLSS_UPGRADE Auto-download DLSS DLLs
dlsshud PROTON_DLSS_INDICATOR DLSS overlay
xess PROTON_XESS_UPGRADE Auto-download XESS
sdlinput PROTON_USE_SDL or PROTON_PREFER_SDL SDL input instead of HIDRAW/Steam Input
wayland PROTON_USE_WAYLAND or PROTON_ENABLE_WAYLAND Enable Wayland driver
wow64 PROTON_USE_WOW64 Enable WoW64
WAYLANDDRV_PRIMARY_MONITOR Primary monitor (e.g. eDP-1)
PROTON_ENABLE_MEDIACONV Enable winegstreamer media converter
WAYLANDDRV_RAWINPUT Raw input sensitivity (0=off, positive=sensitivity)

Proton-CachyOS

Launch: Same as Valve Proton, binary in CachyOS tool directory

Proton launch option env vars:

Compat config string Env var Description
PROTON_LOG Debug log (use "+mfplat,+quartz,+wmvcore,+wmadec,+dmo" for media)
PROTON_LOG_DIR Output log dir (default: $HOME)
PROTON_WAIT_ATTACH Wait for debugger
PROTON_CRASH_REPORT_DIR Crash log dir
wined3d PROTON_USE_WINED3D OpenGL wined3d for d3d11/d3d10/d3d9
nod3d11 PROTON_NO_D3D11 Disable DX11
nod3d10 PROTON_NO_D3D10 Disable DX10/DXGI
dxvkd3d8 PROTON_DXVK_D3D8 Use DXVK d3d8.dll
nofsync PROTON_NO_FSYNC Disable futex sync
HOST_LC_ALL Override system locale
disablenvapi PROTON_DISABLE_NVAPI Disable NVIDIA NVAPI
nativevulkanloader (none) Use game's Vulkan loader (breaks VR)
forcelgadd PROTON_FORCE_LARGE_ADDRESS_AWARE Force LARGE_ADDRESS_AWARE
heapdelayfree PROTON_HEAP_DELAY_FREE Delay memory freeing
gamedrive PROTON_SET_GAME_DRIVE Create S: drive to Steam library
noforcelgadd (none) Disable forcelgadd
oldglstr PROTON_OLD_GL_STRING Limit GL extension string
vkd3dfl12 (none) Force D3D12 feature level 12
vkd3dbindlesstb (none) Force bindless texel buffer
nomfdxgiman WINE_DO_NOT_CREATE_DXGI_DEVICE_MANAGER IMFDXGIDeviceManager workaround
noopwr WINE_DISABLE_VULKAN_OPWR Disable Vulkan OPWR (Wayland)
hidenvgpu PROTON_HIDE_NVIDIA_GPU Hide NVIDIA GPUs as AMD
WINE_FULLSCREEN_INTEGER_SCALING Integer scaling
WINE_USE_KWIN_HACKS KDE windowing hacks
cmdlineappend: (none) Append as game command arg
xalia PROTON_USE_XALIA Enable Xalia
fnad3d11 FNA3D_FORCE_DRIVER=D3D11 Force FNA D3D11
seccomp PROTON_USE_SECCOMP Enable seccomp-bpf
d9vk PROTON_USE_D9VK Use D9VK for d3d9 (obsolete Proton 5.0+)

Proton-CachyOS config env vars:

Compat config string Env var Description
PROTON_DXVK_SAREK Use dxvk-sarek for older GPUs
PROTON_DXVK_LOWLATENCY Enable dxvk-low-latency fork
PROTON_D7VK_DDRAW Use D7VK for DX7-or-lower
fsr4 PROTON_FSR4_UPGRADE Auto-download FSR 4 DLL
fsr4hud PROTON_FSR4_INDICATOR FSR4 watermark
mlfg PROTON_MLFG_UPGRADE Enable MLFG with FSR4 >= 4.0.3
dlss PROTON_DLSS_UPGRADE Auto-download DLSS DLLs
dlsshud PROTON_DLSS_INDICATOR DLSS overlay
xess PROTON_XESS_UPGRADE Auto-download XESS
ffx3 PROTON_FFX3_UPGRADE Auto-download FFX III
ffx4 PROTON_FFX4_UPGRADE Auto-download FFX IV
nvidialibs PROTON_NVIDIA_LIBS Enable nvidia-libs (nvcuda, nvenc, nvml, nvoptix)
nvidialibsno32 PROTON_NVIDIA_LIBS_NO_32BIT 64-bit nvidia libs only
nvcuda PROTON_NVIDIA_NVCUDA Enable nvcuda.dll only
nvenc PROTON_NVIDIA_NVENC Enable nvencodeapi.dll only
nvml PROTON_NVIDIA_NVML Enable nvml.dll only
nvoptix PROTON_NVIDIA_NVOPTIX Enable nvoptix.dll only
nowmdecoration PROTON_NO_WM_DECORATION Disable WM window decorations
wayland PROTON_ENABLE_WAYLAND Enable Wayland (experimental winewayland)
wayland PROTON_USE_WAYLAND Alias of PROTON_ENABLE_WAYLAND
pipewire PROTON_USE_PIPEWIRE Enable winepipewire audio driver
DXVK_HDR Enable HDR (Nvidia < 595.x)
DXVK_NO_HDR Force disable HDR
sdlinput PROTON_PREFER_SDL or PROTON_USE_SDL Use SDL input
PROTON_NO_STEAMINPUT Disable Steam Input
localshadercache PROTON_LOCAL_SHADER_CACHE Per-game shader cache
PROTON_ENABLE_MEDIACONV Enable media converter (debug)
PROTON_MEDIA_FORCE_GST Fix video/audio playback
PROTON_GST_VIDEO_ORIENTATION Video orientation (gstreamer videoflip)
vkreflex DXVK_NVAPI_VKREFLEX Enable Vulkan Reflex via DXVK-NVAPI
lowlatencylayer LOW_LATENCY_LAYER Enable low_latency_layer
PROTON_USE_OPTISCALER Auto-inject OptiScaler
PROTON_DISCORD_BRIDGE Enable rpc-bridge for Discord Rich Presence

Other useful env vars:

Env var Description
WINE_BLOCK_HOSTS Hosts Wine won't connect to (comma/semicolon, max 16 hosts, 256 chars each)
WINEALSA_CHANNELS WineALSA speaker channels (2, 4, 6, 8)
WINEALSA_SPATIAL Spatial audio downmix (1/0)
WINE_AUDIO_DRIVER Audio drivers (default: pipewire,pulse,alsa)
GST_GL_WINDOW GStreamer GL window mode

OBS Game Capture (obs-gamecapture)

Launch: obs-gamecapture [options] -- %command%

Arg Description
--width <w> Capture width
--height <h> Capture height
--rate <fps> Capture frame rate
--no-sound Disable audio capture
-h / --help Show help

Env vars:

Env var Description
OBS_NO_GAMECAPTURE Disable OBS game capture detection
OBS_FORCE_GAMECAPTURE Force OBS game capture
OBS_NO_XLIB Disable XLIB capture backend
OBS_NO_XSHM Disable XSHM capture backend
OBS_NO_VKCAPTURE Disable VK capture backend

gamemode / gamemoderun

Launch: gamemoderun %command%

Env vars:

Env var Description
GAMEMODE_CONFIG Override gamemode.ini location

Steam compat env vars (set by Steam, visible to gamemode):

Variable Description
STEAM_COMPAT_APP_ID Game AppID
STEAM_COMPAT_DATA_PATH Game compatdata path
STEAM_COMPAT_CLIENT_INSTALL_PATH Steam install path
STEAM_COMPAT_INSTALL_PATH Game install path
STEAM_RUNTIME 1 if Steam Runtime active
WINEPREFIX Wine prefix (if through Proton)

Sources

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