Re: So who still thinks software patents are a special case?
All patents are trollable.
What makes you think this particular case is Just Another Patent Troll? This isn't a 'round corner' job, and it isn't a stupidly wide 'we've patented the LED!' claim either. This is a specific inventive step, presumably with actual real-world benefits given that people have bothered to license it already.
Now, perhaps you think the trolling is because they've waited a long time to spring the lawsuit? Well, how easy do you think it is to check each and every LED-using device built in or imported into the US for a "highly insulating monocrystalline gallium nitride film'?