Comment # 22 on bug 1191515 from Stefan Dirsch

Ok. So we had some temporary user space regression in Mesa's nouveau driver it
seems (no idea why this driver is needed at all; we have Intel here and nvidia
is just nice to have for faster rendering) and probably a kernel regression for
suspend, which affectes at least HDMI connections. :-( Thanks for your
patience. Unfortunately I can't provide a solution here. :-(

Since you don't intend to use the nvidia capacities and outputs apparently are
only connected to Intel GPU, it might be an option to disable NVIDIA GPU by
BIOS settings - if possible. That would make things much easier and I could
imaging things then just working out-of-the-box.