Can you run xresprobe nvidia (or xresprobe nv if you're using the open source 
driver) and paste the results here.
Please also attach the result from running ddcprobe.

For me, on an amd64 with nvidia and triple-head, I got blank output from
xresprobe, and ddcprobe segfaulted.

-- 
[apport] xrandr crashed with SIGSEGV in XRRGetScreenInfo()
https://bugs.launchpad.net/bugs/112722
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