This also affects me! Here's a simple test case for someone who doesn't own a 
hi-dpi screen, but does have a 1920x1080 monitor.
Use this image as your background: 
http://i177.photobucket.com/albums/w204/chopin952/Test%20Patterns/Halftone1080p.png
Continue to scale it up and keep looking at the background. Once it hits 2, it 
becomes a grey blur instead of the correct pattern. If you have the desktop 
background set to center instead of scale or zoom or whathaveyou, then once it 
hits two, it will be zoomed in and centered.

(If it's difficult to see around the Display window, remember Alt + F7
is your friend.)

I'm assuming this is because more things scale once you select an even
number. For example, if you change from 1 to 1.88, most of the buttons,
sliders, and checkboxes stay the same size (although the fonts get
bigger). But once you jump from 1.88 to 2, the buttons, sliders, and
checkboxes suddenly decide to increase in size. By the way don't think
this bug report is really the right place to say this, but the slider...
ticky thingy and the checkboxes don't scale well.

Also of note, is if you press the Print Screen button and check the
image dimensions, they're 960x540 instead of 1920x1080 (which is half if
math isn't your strong suit).

Obviously, this feature is sort of a work in progress. And I (sorta)
understand that Unity is still a graphical shell on top of the GNOME
desktop environment so understanding where all this belongs and who's
responsible for resizing what can be a mess. So good luck I guess.

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https://bugs.launchpad.net/bugs/1324278

Title:
  Background image becomes blurry when scale for menu and title bar
  option is set to 2

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