$ dpkg -l | grep libgl1
rc  libgl1-mesa-dri                            7.4-0ubuntu3                     
                A free implementation of the OpenGL API -- D
rc  libgl1-mesa-glx                            7.4-0ubuntu3                     
                A free implementation of the OpenGL API -- G
ii  libgl1-mesa-swx11                          7.4-0ubuntu3                     
                A free implementation of the OpenGL API -- r

$ glxinfo
name of display: :0.0     
display: :0  screen: 0    
direct rendering: No (If you want to find out why, try setting 
LIBGL_DEBUG=verbose)
server glx vendor string: Brian Paul                                            
   
server glx version string: 1.4 Mesa 7.4

-- 
[i965gm] Corrupted X after enabling UXA, unable to log into KDE (UXA bug)
https://bugs.launchpad.net/bugs/364479
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