Tips and Tricks

Asset Overlay

The files in asset_overlay located at ~/.var/app/org.vinegarhq.Sober/data/sober will get used over the ones used by Roblox. Depending on the directory the files were placed in, this will allow for modifications to be made! The modifications will happen after an app restart, and is reversable simply by clearing out the directory.

The asset_overlay directory mirrors packages/com.roblox.client/base.apk/assets when viewed through an archive manager. This means you have to recreate the folder structure as seen in the archive into asset_overlay in order for your modifications to work! Example of replacing the mouse cursor:

~/.var/app/org.vinegarhq.Sober/data/sober/asset_overlay
└── content
    └── textures
        └── Cursors
            └── KeyboardMouse
                ├── ArrowCursor.png
                ├── ArrowFarCursor.png
                └── IBeamCursor.png

Fullscreen

The toggle for fullscreen in the Roblox app has never worked on mobile builds. However, this can be replicated by pressing the F11 key.

Note that Sober remembers the fullscreen state, and will automatically fullscreen again on a relaunch. You cannot close Sober within the Roblox app as well.

FFlags

FFlags (or “Fast Flags”) allows for local configuration overrides for the Roblox client. This system was originally developed to be used by Roblox engineers to dynamically update engine configurations on the fly via. over-the-air (“OTA”) configuration updates rather than pushing an update to the client binaries every time.

Since September 2025, Fast Flags have since been locked down to a select few in a whitelist system. If a flag is not on the official allowlist, it will be ignored even if configured correctly.

Geometry Fast Flags

FFlag Name	Type	Description	Accepted Values
`DFIntCSGLevelOfDetailSwitchingDistance`	integer	Sets level of detail culling for CSG models in studs	0-1000
`DFIntCSGLevelOfDetailSwitchingDistanceL12`	integer	Sets level of detail culling for CSG models in studs (graphic levels 1 and 2)	0-1000
`DFIntCSGLevelOfDetailSwitchingDistanceL23`	integer	Sets level of detail culling for CSG models in studs (graphic levels 2 and 3)	0-1000
`DFIntCSGLevelOfDetailSwitchingDistanceL34`	integer	Sets level of detail culling for CSG models in studs (graphic levels 3 and 4)	0-1000

Rendering Fast Flags

If you intend to use the perfer Vulkan/OpenGL flags, we recommend running flatpak run org.vinegarhq.Sober config on your terminal and select the “Force Legacy Rendering” instead.

FFlag Name	Type	Description	Accepted Values (in range)
`FFlagHandleAltEnterFullscreenManually`	bool	Enables manual control for true fullscreen (is not relevant for Sober)	true/false
`DFFlagTextureQualityOverrideEnabled`	bool	Enables texture quality to be overrided by `DFIntTextureQualityOverride`	true/false
`DFIntTextureQualityOverride`	integer	Sets texture quality level. (`DFFlagTextureQualityOverrideEnabled` must be set to true first)	0-3
`FIntDebugForceMSAASamples`	integer	Force MSAA anti-aliasing sample rate	1; 2; 4
`DFFlagDisableDPIScale`	bool	Disables DPI downscaling (is not relevant for Sober)	true/false
`FFlagDebugGraphicsPreferD3D11`	bool	Prefers DirectX 11 for rendering (is not relevant for Sober)	true/false
`FFlagDebugSkyGray`	bool	Overrides the skybox color to gray, removes atmospheric stars	true/false
`DFFlagDebugPauseVoxelizer`	bool	Disables voxel lighting	true/false
`DFIntDebugFRMQualityLevelOverride`	integer	Overrides graphic quality level (does not affect render distance)	0-21
`FIntFRMMaxGrassDistance`	integer	Sets the maximum distance for grass rendering in studs	0-1000
`FIntFRMMinGrassDistance`	integer	Sets the minimum distance for grass rendering in studs	0-1000
`FFlagDebugGraphicsPreferVulkan`	bool	Prefers Vulkan for rendering	true/false
`FFlagDebugGraphicsPreferOpenGL`	bool	Prefers OpenGL for rendering	true/false

User interface Fast Flags

FFlag Name	Type	Description	Accepted Values
`FIntGrassMovementReducedMotionFactor`	bool	Reduces motion for grass	true/false

Latest Mesa drivers

Mesa 3D is an open source graphics library providing implementations of OpenGL, Vulkan and more. It is the backbone of computer graphics under Linux and other Unix-like operating systems.

Flathub tends to hold major updates to the Mesa 3D library for a period of time. Fortunately, there is a mesa-git extension available in Flathub’s beta repository, allowing you to receive the latest bug fixes and performance improvements to this graphics library, which in turn may improve Sober’s performance. If your GPU has been released very recently and is only supported by the latest version of Mesa, then you would want this extension as well.

Do note that this extension is unstable and little to no testing is done by the Flathub maintainers to ensure its quality, so bugs are to be expected. Everything mentioned in this section does NOT apply to the proprietary NVIDIA driver (not nouveau), as it comes with its own separate 3D library.

To add the Flathub beta repository, run the following command in your terminal:

$ flatpak remote-add --if-not-exists flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo

To install the mesa-git extension, run the following command in your terminal:

$ flatpak install flathub-beta org.freedesktop.Platform.GL.mesa-git

After running that last command, you will be greeted by a selection of Flatpaks to choose from. Choose the one with the highest number after the third slash that does NOT have beta appended to it.

Once that is settled, you can run the following command to make Sober use the mesa-git extension by default.

$ mkdir $XDG_DATA_HOME/applications; cat /var/lib/flatpak/exports/share/applications/org.vinegarhq.Sober.desktop | sed 's/Exec=/Exec=env FLATPAK_GL_DRIVERS=mesa-git /' > $XDG_DATA_HOME/applications/org.vinegarhq.Sober.desktop

If Sober opens to an error message that says SDL_CreateWindow failed: Could not get EGL display, then the mesa-git extension may have been installed for the wrong branch. In that case, run the second command again, then choose the Flatpak with the next highest number after the third slash (the ones with beta appended to them are not included).

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