(In reply to comment #1)
> It seems that this only happens on the second mem sleep - so to trigger it
> looks like I need to boot with tv off, turn on tv but not enaable, sleep and
> resume, then sleep again will give oops.

More testing -

To trigger this I need to resume from mem sleep after hdmi device became active
that wasn't active at boot.

It doesn't matter if it becomes active before I sleep of during sleep - when I
come out of sleep I am then set up for the Oops.

It seems that it's fbcon and nothing to do with sleeping again - I can now
trigger just by switching from X to fbcon VT.