I'm experiencing the same issue but I'm able to move mouse pointer. >From time to time I'm switching between single and dual-monitor configuration on my laptop with dual video (Lenovo V580) and I'm observing alike screen freezing which takes about half of minute.
I/O led does not show heavy activity and it looks like background processes are working (at least music is playing). # lspci -v | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller]) 01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 645M] (rev ff) (prog-if ff) Video Driver: "NVIDIA binary driver - version 331.38 from nvidia-331 (proprietary, tested)" PRIME Profile settings - Intel (Power Saving Mode) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1314871 Title: Ubuntu 14.04 random screen freeze while Normal OS activites To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1314871/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
