Yes, based on what I can find, the Haswell UX303LA has about 61% sRGB
coverage so it sounds likely to be a 6-bit (AKA 18-bit) panel, which
makes it sound even more likely that comment #5 is the cause of the

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  Colour banding and artefacts appear system-wide on an Asus Zenbook
  UX303LA with Intel HD 4400 graphics

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