I installed NVidia current driver from ubuntu software center then i started to see that my monitor resolution is not fixed!! so that every time i log in to my machine i have to change the resolution.
but starting from yesterday, all options have been disappeared & i have one option only 640*480.
i have the problem shown in the link here: https://mooniat.files.wordpress.com/2012/06/colord.png which i think is the cause of this. Any help please, thank you in advance.
specifications: OS: ubuntu 12.04 precise laptop: Dell inspiron N5110 GPU: nvidia GeForce 525M
Thanks again, yours.