This seems more likely to be the dithering bug, have you tried with:
commit c4867936474183332db4c19791a65fdad6474fd5
Author: Daniel Vetter <[email protected]>
Date: Tue Apr 10 10:42:36 2012 +0200
drm/i915: properly compute dp dithering for user-created modes
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https://bugs.launchpad.net/bugs/946311
Title:
only external screen is working with asus zenbook ux31e [eDP1]
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