[UbuntuGnome] nvidia graphic not working on ubuntu gnome 16.04.1

hi
I'm using a lenovo z510, with two graphic cards, one is nvidia geforce 740m and the other one intel, so I installed ubuntu gnome 16.04.1 in lagacy mode(because in uefi mode I get an error when installing grub) then the first boot is ok, it seems the driver is nouveau, and the system is using nvidia(and when it's on nvidia I have a suspend issue, when waking up from suspend i get an black screen, but when I am on intel everything is ok) and then I tried to install proper driver from additional drivers, both for nvidia and intel, and when I do that I can't login, I don't know if it's gdm problem or not but I definitely don't like lightdm. so I tried to install different version of nvidia drivers, all have the same result, I have to use intel graphic card in order to use my ubuntu gnome properly, and there's something else I updated to latest xenial kernel(4.4.15) and it fixed nothing.
Is there a way to fix this?
thank you all

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[UbuntuGnome] nvidia graphic not working on ubuntu gnome 16.04.1