After using few days I've decided to fiddle with the optimus technology as I've seen someone getting it working. So I started playing with different dsdts and kexts, after some experiments I've started to get KP's at boot, so I was unable to boot into single user mode and as my USB stick with ML installation isn't working anymore, I had no choice, just booting up Ubuntu.
So I've mounted my hfs+ partition in ubuntu, tried reverting the changes - unluckily. As I got bored to search for the same websites everytime I boot ubuntu, I decided to install it. Some time later I finally managed to revert all changes to OSX, configure GRUB2 to boot chimera, aaaaand I started to get "Still waiting for root device" thingy...
Things I've tried:
1)fiddling with BIOS
3)countless other boot options
4)changing AHCI kexts
5)trying to repair kext permissions from linux (dunno if that works)
So, what would your suggestions be? btw, here's list of kext's I used when I was trying to get optimus working:
AppleAHCIPort.kext AppleHWSensor.kext AppleIntelHD3000Graphics.kext AppleIntelSNBGraphicsFB.kext AppleLPC.kext AppleMCCSControl.kext AppleSDXC.kext AppleUpstreamUserClient.kext GeForce.kext IO80211Family.kext IOAHCIFamily.kext IONetworkingFamily.kext IOPlatformPluginFamily.kext IOUSBFamily.kext NVDAResman.kext PXHCD.kextI have removed new or restored original kexts afterwards, but anyways.
edit:shoot, this should be in post-installation section...
edit2: managed to create bootable usb install from linux, repaired permissions and disk, everything works fine!