Comment 90 for bug 1292398

Guys, this is just a total shot in the dark and probably won't work, but has anybody tried installing the nvidia-modprobe package? I did this some time ago (I think during 14.10) to fix issues with Darktable. Around the same time, but possibly only later, the second-screen issue disappeared for me. It never occurred to me until now, but there just miiiight be a connection?

I've been using nvidia-modprobe ever since, so I don't know if this has anything to do with it and frankly, I don't think so. But perhaps give it a shot and report back?