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wlroots-hyprland/docs/env_vars.md
Tudor Brindus 1b0e4c7e6e xwayland: introduce WLR_XWAYLAND for specifying which Xwayland to use 
When debugging Xwayland-related issues, a common first step in debugging
has been to ask the reporter to move their real Xwayland to
/usr/bin/Xwayland.bin, and create a shell script starting Xwayland with
extra arguments under the original /usr/bin/Xwayland location.

Introducing a `WLR_XWAYLAND` environment variable makes this less
invasive, by allowing the user to swap out Xwayland without resorting to
global system changes (or source patches).
2020-10-11 09:00:52 +02:00

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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, 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

Generic

  • DISPLAY: if set probe X11 backend in wlr_backend_autocreate
  • WAYLAND_DISPLAY, _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