Comment 9 for bug 93466

(confirmed, yet again)
Guess it's because of the seperate X screens that the one can't detect the other's activity by default. I have them set up that way at least. Also, reversing the bug by running the screensaver from the other X monitor works as expected. Somehow it will need a workaround to detect input from a different X session, but I'm just thinking loud here.

IF this is indeed the cause, is it possible to - as a workaround - somehow send a copy of all the input on different X screens to the (screensaver on the) primary X? (I might not describe it properly but I guess you know what i mean)

Attached my Xorg.conf even though nvidia-settings might have made it quite messy.