The issue was actually due to a combination of NVidia 304.XX driver with linux-image-3.8.0-17-generic. With latest NVidia 304 driver update, problem is gone.
However this could be good that nvidia-current actually points to nvidia-310 instead of NVidia-304, but with latest kernel image NVidia-310 could not install... ** Changed in: linux (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1166988 Title: With latest xserver-xorg update, switching to VT does not work anymore To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1166988/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs