I have an MSI Gaming Laptop GT70, which has the nvidia optimus technology, ie. it uses the intel gfx core for "normal" programs, but will switch over to the nVidia GTX880 mobile GPU for games.
The problem I face is, if I play Elder Scrolls Online in fullscreen mode. The display will lockup if I alt-tab to the desktop and then alt-tab back to the game. This is in Windows 8.1 using nVidia driver 340.52
It works fine if I play in fullscreen borderless window mode, or if I switch to the OpenGL renderer by editing the UserSettings.txt (SET GraphicsDriver.7 "OPENGL"). So it's not a blocking issue, however I wonder if this is a known issue and if something can be done about this?!
I've read about this issue in other games, so it might well be out of Zenimax's hands and be something only nVidia is able to fix?!
The laptop in question is an MSI GT70 2PE Dominator Pro (mouth full!) -
http://www.msi.com/product/nb/GT70-2PE-Dominator-Pro.html