I don't think this is the same as bug #32461
I can ctl-alt-F1 and ctl-alt-F7 as expected.

But if I fn-f7  to cycle between the external display modes, the
external monitor either sees no signal or sees a signal, but has a black
screen.

It does sound a little similar to 
https://launchpad.net/distros/ubuntu/+source/xserver-xorg-video-ati/+bug/27466
but I am unable to run fglrx on my video card.

-- 
External monitor not working Radeon Mobility M6 LY
https://launchpad.net/bugs/67183

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