Mirror displays Ubuntu 12.04 64 bit

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http://ubuntuforums.org – Hello, I recently installed Ubuntu 12.04.2 on a new Gateway laptop that had Windows 8 pre-installed. While using windows 8 I was able to have mirrored displays--the laptop screen and a Philips flat screen TV connected with an HDMI cable. Since installing Ubuntu on the system, it seems to naturally do separate displays, but when I set it to "mirror displays" via the display manager, the only resolution setting offered is 640X480... and that glitches and doesn't last more than a couple minutes. I was just wondering how to go about extending the resolutions, and stabilizing the mirro (Hardware)