dell inspiron resolution problem
 

I have a Dell Inspiron 8500 laptop. I recently installed Linux Mandrake 9.2 Everything worked except the resolution can't go in the higher ones like 1680 x1050. I found some code lines on the internet to insert into the xfreeconfig file, but it wouldn't let me as it was read only. Any body know how to fix?

Open it as root:

I do it this way:

su
<root password>
kate /path/to/xf86config
Change the settings, save the file, close kate
exit
exit

Restart X and 'ta-daaa'