Hi my gf wants ubuntu (14.04) on her acer v3-572g. She needs the Nvidia 840m for games but still wants to use the Intel igpu for power saving.
I get the nvidia 340 drivers installed for the 840m and as long as I dont update from ppa:xorg-edgers/ppa afterwards it logs in just fine. However if I run the updates or have bumblebee installed the computer boots with the splash showing, and then I hear sound of the login screen but its blank and theres no display unless I drop to console. From console I can remove nvidia drivers and get it working again. Not updating from the ppa the computer works okay with the gpu aside from the screen freezes.
some of the things Ive tried
(Ubuntu 14.04 and Nvidia GeForce (840M) compatability on 64-bit laptop)