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

Status in xorg package in Ubuntu:

Bug description:
  My laptop is running Xubuntu 16.04 and recently (don't know when
  exactly) started showing very sluggish display and input behavior:

   - Typed input lags several characters behind.
   - Mouse input is slow (e.g. when drag and dropping elements)
   - /user/lib/xorg/Xorg uses high percantage of CPU ressources (oftentimes 

  Any help is appreciated.

  Please let me know if you need any more information.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Sep 19 21:57:52 2016
  InstallationDate: Installed on 2016-02-07 (225 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to xenial on 2016-08-03 (46 days ago)

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