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I have an Ubuntu 12.10 machine with an Nvidia GeForce GTX 650 which has one vga output and an hdmi output, I already have one monitor connected via vga and I just recently bought an HDMI to VGA converter so I could use HDMI output in the graphics card to add an extra VGA monitor, the cable works fine while running on Windows but, on Ubuntu the screen just stays for 5 to 10 seconds and then goes off, and back again and so on, has anyone experienced something similar?

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