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I'm running Ubuntu 12.04 LTS on a Dell XPS L502X and when I connect the HDMI cable from the TV to the computer Ubuntu detects nothing at all, It works perfectly fine in Windows 7 though. I've already went to the Display control, plugged and unplugged the TV, clicked the Detect Displays button, and nothing. Do I have to activate the HDMI output or something? Because I used another computer with a VGA output and it worked perfectly.

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Could you post the output of the xrandr command when the TV is connected over HDMI? –  Jeremy Kerr Jun 14 '12 at 0:35
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2 Answers 2

On 12.04 the Nvidia cards are not recognized in the display menu. You have to use Nvidia-Xserver-settings to do that.

Type Nvidia in the dash and open Nvidia-Xserver-settings.

Click on X server display configuration and then on detect displays. There you will find many more tweak options. Once ready click on apply and you should be all set.

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I have the exact some model, i had this problem to, and i have tried everything you possibly can do and nothing works.

My workaround was to buy a mini-display to hdmi that looks like thisenter image description here

Every Mac laptop's has this and i really don't know why Dell has it but it does and it works well, you should be able to get one at your computer store if not try here

I asked this question earlier this year and this was my solution. You can find the question here

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