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wlroots reads these environment variables
# wlroots specific
* *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
libinput, drm, wayland, x11, headless, noop)
* *WLR_NO_HARDWARE_CURSORS*: set to 1 to use software cursors instead of
hardware cursors
* *WLR_SESSION*: specifies the `wlr_session` to be used (available sessions:
logind/systemd, libseat, direct)
* *WLR_DIRECT_TTY*: specifies the tty to be used (instead of using /dev/tty)
* *WLR_XWAYLAND*: specifies the path to an Xwayland binary to be used (instead
of following shell search semantics for "Xwayland")
## DRM backend
* *WLR_DRM_DEVICES*: specifies the DRM devices (as a colon separated list)
instead of auto probing them. The first existing device in this list is
considered the primary DRM device.
* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
mode setting
* *WLR_DRM_NO_MODIFIERS*: set to 1 to always allocate planes without modifiers,
this can fix certain modeset failures because of bandwidth restrictions.
## Headless backend
* *WLR_HEADLESS_OUTPUTS*: when using the headless backend specifies the number
of outputs
## libinput backend
* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
## Wayland backend
* *WLR_WL_OUTPUTS*: when using the wayland backend specifies the number of outputs
## X11 backend
* *WLR_X11_OUTPUTS*: when using the X11 backend specifies the number of outputs
## gles2 renderer
* *WLR_RENDERER_ALLOW_SOFTWARE*: allows the gles2 renderer to use software
rendering
# Generic
* *DISPLAY*: if set probe X11 backend in `wlr_backend_autocreate`
* *WAYLAND_DISPLAY*, *WAYLAND_SOCKET*: if set probe Wayland backend in
`wlr_backend_autocreate`
* *XCURSOR_PATH*: directory where xcursors are located
* *XDG_SESSION_ID*: if set, session ID used by the logind session
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