x-org gets frozen or crashes

Unity does not replace Gnome. Unity is a shell for Gnome. When you use Unity, Gnome is running underneath.

What action are you taking to cause the freezing?

Thanks

I mean I had switched to Gnome Shell, sorry.

No particular action, just browsing some website, or managing torrents, it just happens in several situations.

My version is 12.04 LTS and never has worked all right.

Does the system have a make and model?
What video chip does it use?

Is a pc, no make or model. Graphic card is a nvidia ENGT240.

http://i43.tinypic.com/5n7uid.png

Screenshot of nvidia-settings

Please list the output of :

lsb_release -a

Has this prevoisly worked with a different version of ubuntu/linux?

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.2 LTS
Release: 12.04
Codename: precise
*********************
Yes, in previous versions it worked perfect. Since I installed 12.04 I have this problem.

Okay, are you using the latest updates? A possible solution would be using the open-source noaveau driver instead. Though that driver isn't know for its reliability, it may fix this issue.

Hope this Helps

I'm with latest updates, using "current" driver.

I've read about noaveau driver, and the result apprears to be the same, but I could try. Could you refer me any way to do this correctly?

Post #5 at : http://ubuntuforums.org/showthread.php?t=1647587 might help you. Note : You MUST remove the propeitiry drivers first.

I apoligize for being slow