The errors logged:

kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A 
FIFO underrun
kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder 
A FIFO underrun
kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B 
FIFO underrun
kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder 
B FIFO underrun

so be sure to only use the intel driver from the (x)ubuntu archive.

Purge  xserver-xorg-video-intel (sudo apt-get purge ....)
then reinstall it.
Of course if some non trusted packages has also been installed, then goto 
ubuntu archive.

If the problem still persist after the above tweaks done, then check
with a previous kernel. And the irq bios settings needs indeed to be

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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  High CPU usage of /usr/lib/xorg/Xorg

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