Issues with lenovo t420s

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https://bbs.archlinux.org – I have three issues with my lenovo t420s, they might be related but I'm just not smart enough to fix them.1:By default the bios is set to using optimus, and if I leave it at that x starts up all right but I don't think it is using the discrete graphics card at all? If I change the bios to use discrete graphics X fails with message "no screen found". I have seen this is an issue with optimus-laptops but I have also seen reports of getting it to boot of the discrete graphics card. So my question is simply, should it be possible to boot it of the discrete graphics card? (I hav (HowTos)