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I have a screen flickering since my first Ubuntu 16.04.4 LTS installation and tried everything mentioned in this post: Flickering screen with Intel graphics on Ubuntu 17.04 and setting it to nomodeset helps. My problem is that if i set it to nomodeset my second screen, connected via HDMI isn't recognized.

If i don't set nomodeset, HDMI is recognized and it does not flicker on the HDMI screen, just on my laptop screen.

I would love to use both screens!

this is my lshw -C video

   *-display               
   description: VGA compatible controller

   product: Intel Corporation
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 02
   width: 64 bits
   clock: 33MHz
   capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
   configuration: driver=i915_bpo latency=0
   resources: irq:127 memory:b0000000-b0ffffff memory:a0000000-afffffff ioport:5000(size=64)
  • What is the Ubuntu version? – Pilot6 Jun 6 '18 at 17:46
  • Ubuntu 16.04.4 LTS – user838093 Jun 6 '18 at 17:51
  • What is the kernel version uname -a? – Pilot6 Jun 6 '18 at 17:54
  • 4.4.0-127-generic #153-Ubuntu – user838093 Jun 6 '18 at 17:55
  • Start with upgrading the kernel by sudo apt install linux-generic-hwe-16.04 and reboot. – Pilot6 Jun 6 '18 at 17:57
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Your video adapter is probably poorly supported by the old 4.4 kernel.

You can upgrade the kernel in Ubuntu 16.04 to a newer major version by running

sudo apt install linux-generic-hwe-16.04 

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