You can use the `env` keyword to set environment variables prior to the initialization of the Display Server, e.g.: ```ini env = GTK_THEME,Nord ``` {{< hint type=important >}} Hyprland puts the raw string to the envvar with the `env` keyword. You should _not_ add quotes around the values. e.g.: ```ini env = QT_QPA_PLATFORM,wayland ``` and ***NOT*** ```ini env = QT_QPA_PLATFORM,"wayland" ``` {{< /hint >}} Please avoid putting those environment variables in /etc/environment. That will cause all sessions (including Xorg ones) to pick up your wayland-specific environment on traditional Linux distros. # Toolkit Backend Variables - `GDK_BACKEND=wayland,x11` - GTK: Use wayland if available, fall back to x11 if not. - `QT_QPA_PLATFORM="wayland;xcb"` - Qt: Use wayland if available, fall back to x11 if not. - `SDL_VIDEODRIVER=wayland` - Run SDL2 applications on Wayland. Remove or set to `x11` if games that provide older versions of SDL cause compatibility issues - `CLUTTER_BACKEND=wayland` - Clutter package already has wayland enabled, this variable will force Clutter applications to try and use the Wayland backend # XDG Specifications - `XDG_CURRENT_DESKTOP=Hyprland` - `XDG_SESSION_TYPE=wayland` - `XDG_SESSION_DESKTOP=Hyprland` XDG specific environment variables are often detected through portals and applications that may set those for you, however it is not a bad idea to set them explicitly. # Qt Variables - `QT_AUTO_SCREEN_SCALE_FACTOR=1` - [(From the Qt documentation)](https://doc.qt.io/qt-5/highdpi.html) enables automatic scaling, based on the monitor's pixel density - `QT_QPA_PLATFORM=wayland;xcb` - Tell Qt applications to use the Wayland backend, and fall back to x11 if Wayland is unavailable - `QT_WAYLAND_DISABLE_WINDOWDECORATION=1` - Disables window decorations on Qt applications - `QT_QPA_PLATFORMTHEME=qt5ct` - Tells Qt based applications to pick your theme from qt5ct, use with Kvantum. # NVIDIA Specific To force GBM as a backend, set the following environment variables: - `GBM_BACKEND=nvidia-drm` - `__GLX_VENDOR_LIBRARY_NAME=nvidia` > See [Archwiki Wayland Page](https://wiki.archlinux.org/title/Wayland#Requirements) for more details on those variables. - `LIBVA_DRIVER_NAME=nvidia` - Hardware acceleration on NVIDIA GPUs > See [Archwiki Hardware Acecleration Page](https://wiki.archlinux.org/title/Hardware_video_acceleration) > for details and necessary values before setting this variable. - `__GL_GSYNC_ALLOWED` - Controls if G-Sync capable monitors should use Variable Refresh Rate (VRR) > See [Nvidia Documentation](https://download.nvidia.com/XFree86/Linux-32bit-ARM/375.26/README/openglenvvariables.html) for details. - `__GL_VRR_ALLOWED` - Controls if Adaptive Sync should be used. Recommended to set as "0" to avoid having problems on some games. - `WLR_DRM_NO_ATOMIC=1` - use legacy DRM interface instead of atomic mode setting. Might fix flickering issues. # Theming Related Variables - `GTK_THEME` - Set a GTK theme manually, for those who want to avoid appearance tools such as lxappearance or nwg-look - `XCURSOR_THEME` - Set your cursor theme. The theme needs to be installed and readable by your user. - `XCURSOR_SIZE` - Set cursor size. See [here](../../FAQ/) for why you might want this variable set.