340.65 nvidia driver causes screen tearing

Hi, I've updated my nvidia driver from 319.72 to 340.65 through wheezy-backports, it seems that new driver caused screen tearing (at least happend in iceweasel and gnome-terminal), and this phenomenon could be reproduced. My laptop is Thinkpad T530 with Nvidia NVS 5400M as video card. I used the same 20-nvidia.conf as config file for two versions of nvidia driver, is that the reason why I met this problem?

THX

My /etc/X11/xorg.conf.d/20-nvidia.conf :

# nvidia-settings: X configuration file generated by nvidia-settings

# nvidia-settings: version 319.72 (pbuilder@cake) Sat Nov 23 16:37:04 UTC 2013

Section "ServerLayout"

Identifier "Layout0"

Screen 0 "Screen0" 0 0

InputDevice "Keyboard0" "CoreKeyboard"

InputDevice "Mouse0" "CorePointer"

Option "Xinerama" "0"

EndSection

Section "Files"

EndSection

Section "InputDevice"

# generated from default

Identifier "Mouse0"

Driver "mouse"

Option "Protocol" "auto"

Option "Device" "/dev/psaux"

Option "Emulate3Buttons" "no"

Option "ZAxisMapping" "4 5"

EndSection

Section "InputDevice"

# generated from default

Identifier "Keyboard0"

Driver "kbd"

EndSection

Section "Monitor"

# HorizSync source: edid, VertRefresh source: edid

Identifier "Monitor0"

VendorName "Unknown"

ModelName "Lenovo Group Limited"

HorizSync 47.1 - 56.5

VertRefresh 50.0 - 60.0

Option "DPMS"

EndSection

Section "Device"

Identifier "Device0"

Driver "nvidia"

VendorName "NVIDIA Corporation"

BoardName "NVS 5400M"

Option "NoLogo" "1"

Option "RenderAccel" "1"

Option "TripleBuffer" "true"

EndSection

Section "Screen"

Identifier "Screen0"

Device "Device0"

Monitor "Monitor0"

DefaultDepth 24

Option "Stereo" "0"

Option "metamodes" "1600x900_60 +0+0"

SubSection "Display"

Depth 24

EndSubSection

EndSection