The problem seems to be in the graphics driver.

For those having Intel® HD Graphics 4000, check whether this xorg.conf
solves the problem:

$ cat /etc/X11/xorg.conf.d/20-intel.conf
Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option "AccelMethod" "UXA"
EndSection

If it doesn't also install the kernel and X stack of Utopic.
See https://wiki.ubuntu.com/Kernel/LTSEnablementStack
That should definitely solve the problem.

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https://bugs.launchpad.net/bugs/1309801

Title:
  [xubuntu] chromium redraw issue after switching workspaces

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