New to this and admin is going on vacation today. When trying to set the screen size I get a dialog that says "Unable to query version of RandR ..." I am sure it is something wrong in an installation somewhere , but where to look? It seems likely that Rand R is working since the system comes up and operates. I searched the forums and found that something was changed recently to allow screen sizes for netbooks etc. so are we just out of date?
Hmm, I'm not knowledgeable on this but if, for instance, you're using the NVIDIA proprietary driver you can set the resolution with nvidia-settings and randr won't work, I think.
But either way I think you should be able to change resolution in xorg.conf but that's a system-wide setting.
I don't know more than this.