Thanks for the advice.

Unfortunately I don't completely understand what you mean with the

> Of course if some non trusted packages has also been installed, then
goto ubuntu archive.

For the moment I have purged xserver-xorg-video-intel without
reinstalling it (since I've seen that it is optional).

I cannot yet verify with certainty whether this solves the issue because
I haven't found a way to reproduce it in a deterministic way.  That
said, after uninstalling xserver-xorg-video-intel, my virtual terminals
are visible again (which I hadn't mentioned in the original post because
I hadn't thought that this issue might be related).  I will keep this
configuration until I either run into the original issue again or you
advice me to install the package again.

In case this was a misconfiguration on my side (don't know why the
optional package was installed): Sorry for filing a bug report.


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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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