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wlroots reads these environment variables
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# wlroots specific
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* *WLR_DRM_DEVICES*: specifies the DRM devices (as a colon separated list)
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instead of auto probing them. The first existing device in this list is
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considered the primary DRM device.
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* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
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mode setting
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* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
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* *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
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libinput, drm, wayland, x11, headless, noop)
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* *WLR_NO_HARDWARE_CURSORS*: set to 1 to use software cursors instead of
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hardware cursors
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* *WLR_SESSION*: specifies the wlr\_session to be used (available sessions:
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logind/systemd, direct)
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* *WLR_DIRECT_TTY*: specifies the tty to be used (instead of using /dev/tty)
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# Headless backend
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* *WLR_HEADLESS_OUTPUTS*: when using the headless backend specifies the number
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of outputs
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# Wayland backend
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* *WLR_WL_OUTPUTS*: when using the wayland backend specifies the number of outputs
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# X11 backend
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* *WLR_X11_OUTPUTS*: when using the X11 backend specifies the number of outputs
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# Generic
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* *DISPLAY*: if set probe X11 backend in *wlr_backend_autocreate*
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* *WAYLAND_DISPLAY*, *_WAYLAND_DISPLAY*, *WAYLAND_SOCKET*: if set probe Wayland
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backend in *wlr_backend_autocreate*
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* *XCURSOR_PATH*: directory where xcursors are located
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