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wlroots/docs/env_vars.md
Rouven Czerwinski f0594fb732 backend/drm: add env variable to disable modifiers 
In some cases modesets fail if the planes are initialized with
modifiers. Since in this case possibly all planes need to reinitialized,
which is not possible in the current wlroots design, add an environment
variable for affected users.
2020-01-24 19:43:51 +01:00

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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)

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