On Red Hat Enterprise Linux 6, not able to start GUI

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Issue

Not able to start the GUI. From /var/log/Xorg.0.log, getting following logs:

Fatal server error:
[    74.999] xf86MapVidMem: failed to open /dev/mem (Permission denied)

selinux is in enforcing mode.

Environment

Red Hat Enterprise Linux 6.2
selinux

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