ok.. before closing this thread.. I have to say "I THINK I FIXED IT".
I made a clean fedora install (Fedora 18 x64 KDE), then updated and rebooted, then I followed this post
(careful, not all the links are alive, specially the bbswitch one, its no longer working, but if you google bbswitch rpm x64 you can download and install it manually)...
After that, i "updated" just in case, BBswitch and Bumblebee got updated!!!
rebooted, and now my desktop is working perfectly. Working fine so far. got the intel video card working on low loads, and if i do
[n4rfcisco@ASUS ~]$ lspci|grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M] (rev ff)
hopefully will be useful for somebody else.