Comment 20 for bug 272293

I have the same problem. It seems happened after synergy installed.
attach is my /etc/X11/xorg.conf file.

inshion@inshion-laptop:~$ lspci | grep -i nvidia
01:00.0 VGA compatible controller: nVidia Corporation G72M [Quadro NVS 110M/GeForce Go 7300] (rev a1)
inshion@inshion-laptop:~$
inshion@inshion-laptop:~$
inshion@inshion-laptop:~$
inshion@inshion-laptop:~$
inshion@inshion-laptop:~$ lspci | grep -i nvidia
01:00.0 VGA compatible controller: nVidia Corporation G72M [Quadro NVS 110M/GeForce Go 7300] (rev a1)
inshion@inshion-laptop:~$ uname -r
2.6.28-15-generic
inshion@inshion-laptop:~$ dpkg -l | grep nvidia
ii nvidia-173-modaliases 173.14.16-0ubuntu1 Modaliases for the NVIDIA binary X.Org drive
ii nvidia-180-kernel-source 180.44-0ubuntu1 NVIDIA binary kernel module source
ii nvidia-180-libvdpau 180.44-0ubuntu1 Video Decode and Presentation API for Unix
ii nvidia-180-modaliases 180.44-0ubuntu1 Modaliases for the NVIDIA binary X.Org drive
ii nvidia-71-modaliases 71.86.08-0ubuntu1 Modaliases for the NVIDIA binary X.Org drive
ii nvidia-96-modaliases 96.43.10-0ubuntu1 Modaliases for the NVIDIA binary X.Org drive
ii nvidia-common 0.2.11 Find obsolete NVIDIA drivers
ii nvidia-glx-180 180.44-0ubuntu1 NVIDIA binary Xorg driver
ii nvidia-settings 180.25-0ubuntu1 Tool of configuring the NVIDIA graphics driv
inshion@inshion-laptop:~$