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Xorg since version 1.17 doesn't listen to tcp sockets by default unless it's explicitly built with -Dlisten_tcp=true. GDM currently assumes X servers 1.17 and later are always built without specifying -Dlisten_tcp=true and doesn't work properly otherwise. This commit enhances GDM to better handle these non-standard builds by always passing '-nolisten tcp' on the command line when tcp should be disabled, and likewise always passing '-listen tcp' on the command line, assuming the X server is new enough to support it, when tcp should be enabled. Related #704
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