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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
- [Gamescope README](https://github.com/ValveSoftware/gamescope/blob/main/README.md)
- [Steam for Linux README](https://github.com/ValveSoftware/steam-for-linux/blob/main/steam/README.md)
- [Proton-GE README](https://github.com/GloriousEggroll/proton-ge-custom/blob/main/README.md)
- [Proton-CachyOS README](https://github.com/CachyOS/proton-cachyos/blob/cachyos_main/README.md)
- [OBS Studio](https://github.com/obsproject/obs-studio)
- [OBS Game Capture](https://github.com/obsproject/obs-gamecapture)
- [gamemode](https://github.com/gamemodeorg/gamemode)