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I am a relatively inexperienced Ubuntu user: Some time ago I updated my Ubuntu 14.04 LTS and after restarting the system, both my monitors (connected with DVI and HDMI ports) reported that the signal is lost. I was able to get the monitors working again booting with an old kernel.

However, the support for this kernel ended in August 2016 and I should probably find a solution that works with the latest kernels. Hence, I decided to upgrade to Ubuntu 16.04.1 LTS but it lead to a situation where the monitors lost the signal when I installed/boot up the computer. I managed to get the signal back to my screens by setting thenomodeset option in the grub menu.

Unfortunately, now both monitors show the same view which is not what I would like to have.

Does anybody have an idea how to get a continuous dual display working again with the latest kernels? Here is the output of lshw -c video:

 *-display UNCLAIMED     
   description: VGA compatible controller
   product: Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 06
   width: 64 bits
   clock: 33MHz
   capabilities: msi pm vga_controller bus_master cap_list
   configuration: latency=0
   resources: memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64)

and my kernel is now 4.4.0-45-generic (the ubuntu release is 16.04.1 LTS). I have tried to reinstall the graphics drivers using

sudo apt-get install --reinstall xserver-xorg-video-intel xserver xorg-core
sudo dpkg-reconfigure xserver-xorg

But it doesn't seem to help me although I removed the nomodeset option temporarily in order to test the system.

Do you have any ideas or suggestions?

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    Possible duplicate of Ubuntu 14.04 not recognizing installed Intel graphics driver
    – Fabby
    Nov 5, 2016 at 13:50
  • @Fabby I overwrote the old 14.04 installation. It seems that the old installation doesn't affect the problem.
    – twistedtom
    Nov 5, 2016 at 14:54
  • yup, follow the same answer as there...
    – Fabby
    Nov 5, 2016 at 14:59
  • @Fabby I installed the 64-bit version of Intel Graphics Update Tool for Ubuntu 16.04 from (01.org/linuxgraphics/downloads) and updated the driver. It actually updated and added some files but I still encounter the same problem. Without 'nomodeset' option the screens say just "no signal" after the grub menu.
    – twistedtom
    Nov 5, 2016 at 18:31
  • File a bug report with Intel.
    – Fabby
    Nov 5, 2016 at 20:40

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