This works for me, pointing that i have Nvidia 960
Step 1
Download and install Kernel 4.0 Packages from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.0-vivid/
In my case for x64
linux-headers-4.0.0-040000-generic_4.0.0-040000.201504121935_amd64.deb
linux-headers-4.0.0-040000_4.0.0-040000.201504121935_all.deb
linux-image-4.0.0-040000-generic_4.0.0-040000.201504121935_amd64.deb
and install the new kernel
sudo dpkg -i linux-headers-4.*.deb linux-image-4.*.deb
And Nvidia last drivers from it official website (you will download as a script i think, so you will have to give it execute permissions with chmod +x)
http://www.nvidia.es/Download/index.aspx?lang=es
Step 2 Uninstall nvidia's and nouveau's drivers
For get no errors, i did it in recovery mode, in a console as root, you will need reading and writing permissions
mount -o remount,rw /
For some reason when i did that the first time, comand return me an "error", the second time i wrote the sentence, it worked.
once i got reading/writting permissions i proceeded to uninstall all drivers
apt-get remove --purge nvidia*
apt-get remove --purge xserver-xorg-video-nouveau*
and install the executable file that you downloaded from nvidia offical website, i will put my file name.
cd /home/oliver/Download
./NVIDIA-Linux-x86_64-361.42.run
This way now i can access to TTY console, see the elementary logo and Graphical environtment in full resolution.
But ... the elementary logo looks pixelated, TTY in 600x400 so ...
Step 3
In my case for some reason i couldn't install rEFInd as user Suici Doga recommend. So i did manually editing /etc/defaul/grub
sudo nano /etc/default/grub
and adding
GRUB_GFXMODE=1920x1080 # not "auto"
GRUB_GFXPAYLOAD_LINUX=keep
then updating grub
sudo update-grub
I read that is important to know what resolutions your monitor and grub support before to editing the grub file, you can do it with hwinfo ... i couldn't install it, i think it was because i spent many hours trying to find de complete solution (you know trial and error).
Thanks to user Suici Doga for his help!