Using triple monitors with an NVIDIA Fermi card does not work on RHEL 6.

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Issue

Using triple monitors with an NVIDIA Fermi card does not work.
On a Lenovo Thinkpad T420, Gnome can detect 3 monitors, but can only enable 2 at a time.

Environment

Red Hat Enterprise Linux (RHEL) 6.
Lenovo Thinkpad T420 with NVIDIA Fermi archetecture video adapters

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