Hello,
  I had the same problem..  In my situation, X was configured to the highest
resolution, and the lowest colour spectrum (8 bit).  I was not much of an
X-windows guy previous to Linux, so I edited the XF86Config file.  You'll
see a list of all the settings, just erase the ones you don't want and place
the one you want as default as the first of configuration setting.  Hope
this helps.

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