I was able to resolve this with the following steps on a Dell Lattitude E6440 
(Radeon HD 8670a): 
I did a full update (sudo apt-get update, sudo apt-get dist-upgrade) and 
installed Gnome (sudo apt-get install gnome), selecting GDM as the display 
manager.

It occasionally gets stuck on a reboot but other than that it works
great. Hope this helps.

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1301839

Title:
  AMD Radeon HD 8670A/8670M/8690M[1002:6660] Low-graphic mode with
  Trusty

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