Red Hat Bugzilla – Bug 607566
vnc.so : VNC viewer blocked when dpms becomes active on the server side.
Last modified: 2013-10-02 08:02:24 EDT
This bug has been copied from bug #581478 and has been proposed
to be backported to 5.5 z-stream (EUS).
According to the HowToTest section  and , I'm setting the Verified field to Customer.
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libvnc.so module to Xorg wasn't able to wake up the main Xorg process when entered to the DPMS standby mode. Now, when libvnc.so receives keyboard or mouse event over network, it wakes up the Xorg and turns down running screensaver.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.