How to enable Xorg debug log verbosity when using GDM

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Issue

An in-house X application is crashing Xorg/GDM and I need to increase the log verbosity in /var/log/Xorg.*.log to analyse the cause.

Environment

Red Hat Enterprise Linux (RHEL) 5 with GNOME Display Manager (GDM)
Red Hat Enterprise Linux (RHEL) 6 with GNOME Display Manager (GDM)

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