[ubuntu] Dual Monitor, Same Type, DIfferent Resolution

view story

http://ubuntuforums.org – Hi, I'm using dual monitor on Ubuntu 12.10. Both monitor had same brand and type, the only difference is one using DVI cable and others using RGB. The DVI Monitor resolution are 1280x1024 and the other monitor are 1024x768. How I could change the resolution of my RGB monitor to be the same as DVI monitor. Because on NVidia X Server Settings, the RGB monitor don't have option for 1280x1024. Using xrandr -q I got this Code: Screen 0: minimum 8 x 8, current 2304 x 1024, maximum 16384 x 16384 DVI-I-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm   (Hardware)