Comment 5 for bug 188951

>"Automatic detection of the graphics card is fine, but how do i specify
>my monitor resolution and refresh rate? There is no word about it in the
>document you specified."

From the Document

"References to device and monitor are implicit, default monitor resolution is detected automatically, and resolutions and multihead are better configured with XRandR and displayconfig-gtk."

so yes the document says you should use XRandR or displayconfig-gtk