Gdm not working on Vaio SVS13A

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https://bbs.archlinux.org – Hi to all,I just managed to install and run archlinux on a brand new VAIO SVS13A with Insyde H2O EFI, core i7 and intel HD4000 graphics card. The notebook also has a discrete nvidia graphics card. I was able to install Xorg and startx shows the minimal xorg environment so it should work fine but when I try to run gdm only a black screen appears with the clock that tells you to wait.... What can be wrong? I tried to look for error logs but it doesn't seem to show errors, the last lines are:intel(0): Modeline "1600x900"x0.0 100.22 1600 ...... .... AIGLX: Suspending AIGLX clients f (HowTos)