I have the same problem after a fresh installation of Ubuntu 14.04.3 LTS. My laptop is Thinkpad W530, the graphics card is Nvidia K1000. I use two monitors and the the screen freezes from time to time when I running Chrome. I can move the mouse, but everything else freezes.
Ctrl+Alt+F1 does not work for me. But I can restart the machine with the magic key (Alt+PrtSc+REISUB) -- 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/1314871 Title: Graphics freeze, with applications continuing working properly To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1314871/+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