[ubuntu] When Setting Up Dual Monitors with Nvidia The Second Display got a Low Resolution?

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http://ubuntuforums.org – I have just setup a dual monitor system with a 23 inch LED monitor and a 19 inch LCD monitor. The 23 inch one is connected through HDMI. The 19 inch one is connected to the analogue port of the same GPU (Nvidia Geforce 210). In Ubuntu 12.10, after installing Nvidia drivers, the 23 inch monitor works fine but the 19 inch monitor got a very low resolution. When I set the correct resolution, the desktop goes out of the screen. Also I feel a small lag in animations on the 23 inch monitor. Things work fine under Windows 8.... My questions are... How to fix the resolution in the small monitor? W (Hardware)