= Using RStudio in a VNC session =
Rstudio per default wants to use a GPU for rendering. Disabling this by setting the following environment variable before starting `rstudio` is recommended as a solution to similar problems:
{{{
export RSTUDIO_CHROMIUM_ARGUMENTS='--disable-gpu'
}}}
This does not work if RStudio is started in a VNC session<<FootNote([[RemoteAccess/VNC|Remote access to a Linux host's desktop with VNC]])>> or when using X11 forwarding<<FootNote([[FAQ/X11macOS|Forward X11 applications to a macOS client]])>> <<FootNote([[FAQ/X11Windows|Forward X11 applications to a Windows client]])>>. RStudio will not start and display an error messages like the following:
{{{
WebEngineContext used before QtWebEngine::initialize() or OpenGL context creation failed.
}}}

To use RStudio in a VNC session or with X11 forwarding, add the line `desktop.renderingEngine=software` below the section `[General]` to the file `$HOME/.config/RStudio/desktop.ini`.<<BR>>
The file might then look something like this:
{{{
[General]
cookies=@Invalid()
desktop.renderingEngine=software

[mainwindow]
geometry=@ByteArray(...
}}}