I have a problem with this configuration:

Asus K55V, Ubuntu 12.04 LTS and Nvidia driver 304.51.

I have remove the nouveau driver with:

apt-get --purge remove xserver-xorg-video-nouveau

I installed the official nvidia driver (from www.nvidia.com) but when I reboot the PC the resolution of screen is only 640x480 and the monitor is resized.

Mo solution at this problem if i change the xorg.conf.

Now i have uninstall the nvidia driver and reinstall with

sudo apt-get purge nvidia-current
sudo apt-add-repository ppa:ubuntu-x-swat/x-updates 
sudo apt-get update 
sudo apt-get install nvidia-current

When I reboot the screen resolution and size is OK, but if I start nvidia-setting I received the message:

You do not appear to be using the NVIDIA X driver.

and with command:

sudo lshw -c display | grep driver

I received

configuration: driver=i915 latency=0

This sound like the system is using the Intel card. When I launch command lspci | grep VGA the output is:

00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation Device 1058 (rev ff)

And there is no /etc/X11/xorg.conf. I have read a lot of guides on internet but without success.. How i can use nvidia card with the driver that i have installed?