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Reword docs about fallbacks on headless linux. #20664

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Jul 18, 2021
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Reword docs about fallbacks on headless linux. #20664

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8 changes: 0 additions & 8 deletions doc/faq/environment_variables_faq.rst
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Expand Up @@ -7,14 +7,6 @@ Environment variables
.. contents::
:backlinks: none


.. envvar:: DISPLAY

The server and screen on which to place windows. This is interpreted by GUI
toolkits in a backend-specific manner, but generally refers to an `X.org
display name
<https://www.x.org/releases/X11R7.7/doc/man/man7/X.7.xhtml#heading5>`_.

.. envvar:: HOME

The user's home directory. On Linux, :envvar:`~ <HOME>` is shorthand for :envvar:`HOME`.
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9 changes: 4 additions & 5 deletions tutorials/introductory/usage.py
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Expand Up @@ -299,11 +299,10 @@ def my_plotter(ax, data1, data2, param_dict):
#
# Without a backend explicitly set, Matplotlib automatically detects a usable
# backend based on what is available on your system and on whether a GUI event
# loop is already running. On Linux, if the environment variable
# :envvar:`DISPLAY` is unset, the "event loop" is identified as "headless",
# which causes a fallback to a noninteractive backend (agg); in all other
# cases, an interactive backend is preferred (usually, at least tkagg will be
# available).
# loop is already running. The first usable backend in the following list is
# selected: MacOSX, Qt5Agg, Gtk3Agg, TkAgg, WxAgg, Agg. The last, Agg, is a
# non-interactive backend that can only write to files. It is used on Linux,
# if Matplotlib cannot connect to either an X display or a Wayland display.
#
# Here is a detailed description of the configuration methods:
#
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