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112 lines
3.6 KiB
Markdown
112 lines
3.6 KiB
Markdown
---
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weight: 15
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title: Environment variables
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---
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You can use the `env` keyword to set environment variables prior to the
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initialization of the Display Server, e.g.:
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```ini
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env = GTK_THEME,Nord
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```
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{{< callout >}}
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Hyprland puts the raw string to the envvar with the `env` keyword. You should
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_not_ add quotes around the values.
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e.g.:
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```ini
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env = QT_QPA_PLATFORM,wayland
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```
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and _**NOT**_
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```ini
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env = QT_QPA_PLATFORM,"wayland"
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```
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{{< /callout >}}
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Please avoid putting those environment variables in /etc/environment. That will
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cause all sessions (including Xorg ones) to pick up your wayland-specific
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environment on traditional Linux distros.
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## Hyprland Environment Variables
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- `HYPRLAND_LOG_WLR=1` - Enables more verbose logging of wlroots.
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- `HYPRLAND_NO_RT=1` - Disables realtime priority setting by Hyprland.
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- `HYPRLAND_NO_SD_NOTIFY=1` - If systemd, disables the `sd_notify` calls.
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## Toolkit Backend Variables
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- `env = GDK_BACKEND,wayland,x11,*` - GTK: Use wayland if available. If not: try x11, then any other GDK backend.
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not.
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- `env = QT_QPA_PLATFORM,wayland;xcb` - Qt: Use wayland if available, fall back to
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x11 if not.
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- `env = SDL_VIDEODRIVER,wayland` - Run SDL2 applications on Wayland. Remove or set to
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`x11` if games that provide older versions of SDL cause compatibility issues
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- `env = CLUTTER_BACKEND,wayland` - Clutter package already has wayland enabled, this
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variable will force Clutter applications to try and use the Wayland backend
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## XDG Specifications
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- `env = XDG_CURRENT_DESKTOP,Hyprland`
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- `env = XDG_SESSION_TYPE,wayland`
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- `env = XDG_SESSION_DESKTOP,Hyprland`
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XDG specific environment variables are often detected through portals and
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applications that may set those for you, however it is not a bad idea to set
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them explicitly.
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## Qt Variables
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- `env = QT_AUTO_SCREEN_SCALE_FACTOR,1` -
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[(From the Qt documentation)](https://doc.qt.io/qt-5/highdpi.html) enables
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automatic scaling, based on the monitor's pixel density
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- `env = QT_QPA_PLATFORM,wayland;xcb` - Tell Qt applications to use the Wayland
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backend, and fall back to x11 if Wayland is unavailable
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- `env = QT_WAYLAND_DISABLE_WINDOWDECORATION,1` - Disables window decorations on Qt
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applications
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- `env = QT_QPA_PLATFORMTHEME,qt5ct` - Tells Qt based applications to pick your theme
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from qt5ct, use with Kvantum.
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## NVIDIA Specific
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To force GBM as a backend, set the following environment variables:
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- `env = GBM_BACKEND,nvidia-drm`
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- `env = __GLX_VENDOR_LIBRARY_NAME,nvidia`
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> See
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> [Archwiki Wayland Page](https://wiki.archlinux.org/title/Wayland#Requirements)
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> for more details on those variables.
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- `env = LIBVA_DRIVER_NAME,nvidia` - Hardware acceleration on NVIDIA GPUs
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> See
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> [Archwiki Hardware Acceleration Page](https://wiki.archlinux.org/title/Hardware_video_acceleration)
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> for details and necessary values before setting this variable.
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- `__GL_GSYNC_ALLOWED` - Controls if G-Sync capable monitors should use Variable
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Refresh Rate (VRR)
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> See
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> [Nvidia Documentation](https://download.nvidia.com/XFree86/Linux-32bit-ARM/375.26/README/openglenvvariables.html)
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> for details.
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- `__GL_VRR_ALLOWED` - Controls if Adaptive Sync should be used. Recommended to
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set as "0" to avoid having problems on some games.
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- `env = WLR_DRM_NO_ATOMIC,1` - use legacy DRM interface instead of atomic mode
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setting. Might fix flickering issues.
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## Theming Related Variables
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- `GTK_THEME` - Set a GTK theme manually, for those who want to avoid appearance
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tools such as lxappearance or nwg-look
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- `XCURSOR_THEME` - Set your cursor theme. The theme needs to be installed and
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readable by your user.
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- `XCURSOR_SIZE` - Set cursor size. See [here](../../FAQ/) for why you might
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want this variable set.
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