Update for the information .
I am using Ubuntu 14.04.1
I get this problem after upgrading to 14.04.1 . I never get this issue in 13.10
the result of lshw command
*-display
description: VGA compatible controller
product: GF104 [GeForce GTX 460]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:46 memory:f4000000-f5ffffff memory:e0000000-e7ffffff
memory:e8000000-ebffffff ioport:6000(size=128) memory:ec000000-ec07ffff
Driver Nvidia 331.38
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