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This question is an exact duplicate of:

I am using Ubuntu 14.04 kde plasma 5 - Dell xps laptop - graphics card nvidia GeForce GT 550m.

My two monitors won't work together! When I set the laptop screen as principal monitor, the external monitor is just blank. I can see the cursor, I can drag windows, but this is all I can do. And vice versa, the same thing happen when I set the external monitor as principal display!

I have tried several drivers (nouveau, proprietary...), I've tried to change settings in kde monitor settings and nvidia x server, I even tried to speak gently to my computer

Can you help me please?

marked as duplicate by Elder Geek, Eric Carvalho, Fabby, 2707974, Ravexina Apr 20 '17 at 7:30

This question was marked as an exact duplicate of an existing question.

  • This question has been asked a lot, here are some links to answers to try! askubuntu.com/questions/557488/… askubuntu.com/questions/623367/… Please tell me if any of these(and which one) worked. Also, does the other monitor ever show the correct screen for a couple seconds? As other users with the same problem can see the correct thing for 2-3 seconds before it turns blank. – Provided Apr 16 '17 at 16:58
  • I suspect the solution there is out of date? – Zanna Apr 19 '17 at 5:01
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I have the Nvidia 540M and I also faced some problems with Nouveau driver, but I figured out a solution quite simply after hours and days of search, when Nvidia finally released there driver on Ubuntu.

  • I suggest you to install the latest tested Nvidia Driver (346.96) by using the graphical interface (Drivers > Additional Drivers).

  • Do not forget to reboot after a proper installation and ensure that you actually run this driver.

  • Then, open NVIDIA X Server settings. On "Prime profiles" menu, check "Nvidia (Performance mode)".

  • You can finally perform some checks while pluging in in your monitor. It should appear on the Server settings menu, and can be easily configured.

  • I already tried this, but I will give it a try again. I will also try Bumblebee, see if it solves my problems. thx – Ôdré Delugré Oct 27 '15 at 20:38

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