The ability to offload rendering from one video card to another is already implemented. It is called PRIME. The problem in your case is that the open-source nouveau driver in Ubuntu 14.04 only has basic support for your NVIDIA GTX 750 and needs you to extract the microcode files after installing the proprietary NVIDIA driver, after which you can uninstall the proprietary driver if you want.
The upcoming upstream 4.1 linux kernel contains an updated nouveau driver which can auto-generate the necessary microcode files. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1329201 Title: Onboard graphics takes priority over card To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1329201/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
