> xrandr --output DP1 --set audio off

looks good:

I plugged my laptop into the dock, and it came up at the medium
resolution it was running at earlier in the day.  I ran that command,
and the screen blanked briefly, I guess while the dp link was
reestablished.  I then used the displays panel to switch up to full
resolution and it worked.

So, 1/1.  But, this has always been a bit intermittent, so more
testing might be needed.

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https://bugs.launchpad.net/bugs/745112

Title:
  [arrandale] desktop is messed up with external monitors (x86_64)

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