I was absolutely positive I had replied to the comment before the last
already, but seems I haven't.

It seems the good old ForceEnablePipeA hack is needed on my laptop. The
strange thing is that it hasn't been needed ever before, so I don't
understand why now. As with jhansonxi, vesa eliminates the problems, and
suspend outside of X works fine 100% of the time.

Now, I have been using ForceEnablePipeA for a while and everything has
worked just fine, changing VT, suspend, everything. Except, when an
external display is attached, in which case the problem re-occurs, i.e.
~33% success when switching VT.

jhansonxi, could you possibly try to add 
Option ForceEnablePipeA "true"
to xorg.conf and see if it works out for you?

-- 
occasional hard crash on vt switch
https://bugs.launchpad.net/bugs/204603
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