NVS4200M + 13.1 results in X11 no devices detected

Hi,

some time ago I read that the 'new' kernel 3.12 should support NVIDIA optimus and therefore I decided to give it a try. On my Thinkpad T420S I switch from the integrated graphics only mode to Nvidia Optimus which infact allows the NVS4200M and the internal Intel graphics to be used.
Then in booted in 13.1 and installed a 3.12 kernel from the repository and successfully booted into it. Then, I added the Nvidia repository ( ftp://download.nvidia.com/opensuse/13.1/ ) and installed the automatically suggested Nvidia drivers. Now, after rebooting, my X11 seems to be 'broken' and I get the following error:
Unfortunately, I dont know how to open the console, because the only thing I see is the boot log. The linked log files I extracted from my windows which is installed on another partition. Is there any way to fix this problem? Thank you very much in advance!

Please see for the complete Xorg.log here: [ 10.832] This is a pre-release version of the X server from The X.Org Foun - Pastebin.com
and here the boot log: dracut-initqueue[233]: ln: failed to create symbolic link '/dev/resume': File ex - Pastebin.com