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This MB has three video outputs (RGB, DVI and HDMI). Ubuntu detects both the RGB and DVI monitors properly, but doesn't show anything on the DVI. I can tell it is trying to display something, because the DVI monitor displays a "no signal" message when the system is in power-save mode and immediately goes black when I move the mouse.

My processor is a i3 540.

I have the BIOS set to IDG+PCE. I tried all the other options too (PCI wasn't a good idea, since I don't have a graphics card, but I tried it anyway).

So, what is it that I am missing?

Thanks.

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closed as too localized by fossfreedom♦ Aug 24 '12 at 13:18

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, see the FAQ.

2 Answers

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You should only need to enable the display by the Displays application, you can find that by searching the Dash Home.

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Both displays are enabled. In fact, when I start up a new app, it frequently doesn't show up because it got rendered on the DVI monitor's area. – Gabriel Aug 23 '12 at 15:26
Try enabling Mirror Display and see if it shows anything, also I assume you've tried swapping over the cables or trying different cables to rule out issues with the ports themselves. Recently we had a Sandy Bridge motherboard here stop detecting monitors on the DVI port completly. – Skid Aug 23 '12 at 15:30
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I found out it's a hardware problem. If I just touch the RGB connector with the RGB cable from the other monitor, the image comes up. Maybe the ground pin on the DVI cable is bad.

Thank you for your tips.

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