grub2 - Black screen on boot with thinkpad yoga 14 and ubuntu/windows 8.1 dual boot

I tried to install ubuntu 14.04 on my new thinkpad yoga 14.

The installation seems ok I can choose windows when GRUB starts and it works. But if I choose ubuntu I get a black screen and have to hard reboot my laptop.

I tried to add nomodeset in the settings of ubuntu in GRUB and it starts and work well. However if I don't write this it won't start

I would like to find why it won't start in quiet splash mode.

I tought it was because of the nvidia geforce 840M graphic card so I tried to install nvidia proprietary drivers but I couldn't log into the graphic ubuntu and I had to uninstall them using the terminal.

I'm a pretty new user and I don't know what else it could be. I searched but topics on thinkpad yoga are rare and I didn't find other people with the same issue.

It sounds like Ubuntu boots successfully but cannot display anything. The reason is that you have a new graphic card that partially supported in Ubuntu 14.04. Ubuntu 14.04 supports nvidia 331 drivers by default while your card was first supported on nvidia 337+ drivers.

Therefore, you have two options for fixing it: Installing Ubuntu 14.10 (Note: it's not LTS!) or trying to install newer drivers.

1. sudo apt-get remove --purge nvidia-*


2. sudo add-apt-repository ppa:xorg-edgers/ppa


3. sudo apt-get update


4. sudo apt-get install nvidia-349 nvidia-settings