I found the blank screen is actually caused busy xorg process. And there are huge number of error like below in kern.log. Add intel_iommu=off to kernel boot option and now it works perfectly.
Dec 24 13:28:54 ainur kernel: [ 420.863224] DMAR:[DMA Read] Request device [01:00.0] fault addr 122886000 Dec 24 13:28:54 ainur kernel: [ 420.863225] DMAR:[fault reason 01] Present bit in root entry is clear Dec 24 13:28:54 ainur kernel: [ 420.866458] DRHD: handling fault status reg 2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/901386 Title: Ubuntu 3.2 kernels vs. nvidia-current vs GTX 560 (Mainline works) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/901386/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
