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<part id="running-mutter">
<title>Running Mutter</title>
<partintro>
<section id="environment-variables">
<title>Environment Variables</title>
<para>
Mutter automatically checks environment variables during
its initialization. These environment variables are meant
as debug tools or overrides for default behaviours:
</para>
<variablelist>
<varlistentry>
<term>MUTTER_VERBOSE</term>
<listitem>
<para>Enable verbose mode, in which more information is printed to the console. Mutter needs to be built with the --enable-verbose-mode option (enabled by default). For more fine-grained control of the output, see meta_add_verbose_topic().</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_DEBUG</term>
<listitem>
<para>Traps and prints X errors to the console.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_G_FATAL_WARNINGS</term>
<listitem>
<para>Causes any logging from the domains Mutter, Gtk, Gdk, Pango or GLib to terminate the process (only when using the log functions in GLib).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_USE_LOGFILE</term>
<listitem>
<para>Log all messages to a temporary file.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_DEBUG_XINERAMA</term>
<listitem>
<para>Log extra information about support of the XINERAMA extension.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_DEBUG_SM</term>
<listitem>
<para>Log extra information about session management.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_DEBUG_BUTTON_GRABS</term>
<listitem>
<para>Log extra information about button grabs.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_SYNC</term>
<listitem>
<para>Call XSync after each X call.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_DISPLAY</term>
<listitem>
<para>Name of the X11 display to use.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>META_DISABLE_MIPMAPS</term>
<listitem>
<para>Disable use of mipmaps for the textures that back window pixmaps.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_USE_STATIC_GRAVITY</term>
<listitem>
<para>Enable support for clients with static bit-gravity.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_WM_CLASS_FILTER</term>
<listitem>
<para>Comma-separated list of WM_CLASS names to which to restrict Mutter to.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>MUTTER_DISABLE_FALLBACK_COLOR</term>
<listitem>
<para>Disable fallback for themed colors, for easier detection of typographical errors.</para>
</listitem>
</varlistentry>
</variablelist>
</section>
</partintro>
</part>
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