(In reply to comment #5)
> Created attachment 91609 [details] [review] [review]
> testing patch
> 
> Does the attached patch help?  If so, try and narrow down which changes fix
> the issue.

I have added this patch to the Fedora kernel 3.13.0-0.rc7.git2.1.fc21.x86_64
and the results are the same, sometimes it halts while the kernel is booting,
and other times I can even login in KDE, but suddenly the screen is corrupted
and goes black.

I attach some logs of when I was able to boot and take them.