Documenting the workaround for people who bumps in the same issue 
(documentation around the web is scattered and unclear).
* start a terminal (pressing the key combination Super+T should do)
* enter the following commands to create the configuration file
  sudo mkdir -p /etc/X11/xorg.conf.d/
  sudo nano /etc/X11/xorg.conf.d/20-radeon.conf
* in the configuration file, enter the follwing lines
  Section "Device"
      Identifier "Radeon"
      Driver "radeon"
      Option "AccelMethod" "EXA"
  EndSection
* press CTRL+X, then Y to save

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https://bugs.launchpad.net/bugs/1319220

Title:
  XFCE Logout hangs for a few minutes

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