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Mutter automatically checks environment variables during its initialization. These environment variables are meant as debug tools or overrides for default behaviours:
MUTTER_VERBOSE |
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 |
MUTTER_DEBUG |
Traps and prints X errors to the console. |
MUTTER_G_FATAL_WARNINGS |
Causes any logging from the domains Mutter, Gtk, Gdk, Pango or GLib to terminate the process (only when using the log functions in GLib). |
MUTTER_USE_LOGFILE |
Log all messages to a temporary file. |
MUTTER_DEBUG_XINERAMA |
Log extra information about support of the XINERAMA extension. |
MUTTER_DEBUG_SM |
Log extra information about session management. |
MUTTER_DEBUG_BUTTON_GRABS |
Log extra information about button grabs. |
MUTTER_SYNC |
Call XSync after each X call. |
MUTTER_DISPLAY |
Name of the X11 display to use. |
META_DISABLE_MIPMAPS |
Disable use of mipmaps for the textures that back window pixmaps. |
MUTTER_USE_STATIC_GRAVITY |
Enable support for clients with static bit-gravity. |
MUTTER_WM_CLASS_FILTER |
Comma-separated list of WM_CLASS names to which to restrict Mutter to. |
MUTTER_DISABLE_FALLBACK_COLOR |
Disable fallback for themed colors, for easier detection of typographical errors. |