System freezes occasionally on boot at video switch in Red Hat Enterprise Linux6.

Issue

• About 15% of the time when the system boots, it freezes about at the time one would expect it to switch its video mode. It appears there is a race condition that occasionally causes booting to fail.

• When the systems freezes, it must be turned off (with the power switch because ctrl-alt-del does not work).

• SSH login is also not possible at the time of issue.

• Getting following error on screen :

  [drm] radeon defaulting to kernel modesetting.
  [drm] radeon kernel modesetting enabled.
  checking generic (e0000000 500000) vs hw (e0000000 10000000)
  fb: conflicting fb hw usage radeondrmfb vs EFI VGA - removing generic driver
  Console: switching to colour dummy device 80x25
  radeon 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
  [drm] initializing kernel modesetting (TURKS 0x1002:0x675D 0x1028:0x2B22).
  [drm] register mmio base: 0xF0020000
  [drm] register mmio size: 131072
  radeon 0000:01:00.0: Invalid ROM contents