https://bugs.freedesktop.org/show_bug.cgi?id=66473
--- Comment #2 from Andy Furniss adf.lists@gmail.com --- (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.