I don't understand your problem.
I've installed kernel 3.11 and I am using nvidia-legacy-304xx-driver and xserver-xorg-video-nvidia-legacy-304xx. I did this days before you posted your fix. There was no problem to fix.
towo provided siduction packages *some days ago* which you may install enabling the siduction fixes repo. And today Debian provides new packages, too (which I haven't installed yet and therefor cannot tell whether they work or not).
So what's the problem? If it is about how *you* fix this problem on your own you'd better post in the experimental or kernelhacking forum. Because the "fix" you provided was obsolete when you posted it (and wasn't even a fix for you).
To avoid confusion you should mark this thread as "solved" (at the latest after you reinstalled siduction and nvidia-legacy-304xx successfully).