It would also be useful to capture the X calls that gnome-settings-daemon 
makes.  You should be able to do this by installing the ‘xtrace’ package, and 
running
"""
killall gnome-settings-daemon && xtrace -o ~/gnome-settings-daemon.xtrace 
/usr/lib/gnome-settings-daemon/gnome-settings-daemon
"""
at a terminal.  This should kill the existing daemon and then start a new one, 
capturing all the X calls it makes to ~/gnome-settings-daemon.xtrace.

Then, cycle through the fn-f7 options again - both with the displays
panel open, and without, so we get an example of both working and broken
behaviour - and attach the ~/gnome-settings-daemon.xtrace file here.

If this is too complicated, the gsd-debug-randr.log file Sebastian was
asking for above might contain enough information to debug this problem,
so don't worry if it's too much effort.

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https://bugs.launchpad.net/bugs/820327

Title:
  Fn+F7 cycling gives external monitor incorrect resolution on Thinkpad
  x220

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