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I'm unsuccessfully trying to setup two display monitors in Dell OptiPlex 3020 with Ubuntu 16.10.

My main display is at VGA output and second and undetected is at DisplayPort.

Following goes some configurations details:

$ uname -a

Linux desa475 4.8.0-34-generic #36-Ubuntu SMP Wed Dec 21 17:24:18 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ lsmod | grep video

video                  40960  2 dell_wmi,i915

$ xrandr -q

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)

(DP-1 is always disconnected)

$ lspci

00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d4)
00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d4)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation C220 Series Chipset Family H81 Express LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 04)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

$ ll /etc/X11

total 84
drwxr-xr-x  10 root root  4096 out 12 16:30 ./
drwxr-xr-x 142 root root 12288 jan 24 19:38 ../
drwxr-xr-x   2 root root  4096 out 12 16:30 app-defaults/
-rw-r--r--   1 root root    15 out 12 16:30 default-display-manager
drwxr-xr-x   4 root root  4096 out 12 16:28 fonts/
-rw-r--r--   1 root root 17394 set 27 14:03 rgb.txt
drwxr-xr-x   2 root root  4096 jan 17 15:07 xinit/
drwxr-xr-x   2 root root  4096 mai 24  2016 xkb/
-rwxr-xr-x   1 root root   709 set 27 14:03 Xreset*
drwxr-xr-x   2 root root  4096 out 12 16:28 Xreset.d/
drwxr-xr-x   2 root root  4096 out 12 16:28 Xresources/
-rwxr-xr-x   1 root root  3730 set 27 14:08 Xsession*
drwxr-xr-x   2 root root  4096 jan 17 17:06 Xsession.d/
-rw-r--r--   1 root root   265 set 27 14:03 Xsession.options
drwxr-xr-x   2 root root  4096 out 12 16:30 xsm/

About my attempts:

  1. Firstly, I've checked my hardware: so I've found that my BIOS version was kind of old (A03) and I did an upgrade to A14 as advised here. After that a new video option apeared at BIOS menu where I could selected between "Auto" and "Intel HD graphics". None of than worked.

  2. I've also tried to work with cvt and xrandr to add a new mode and force the output but I always get ""xrandr: Configure crtc 1 failed";

  3. I've also up to date versions os nvidia and intel graphics;

  4. I've also tested one monitor only on DisplayPort, but it doesn't work either.

I really can't say where the issue is: hardware, driver, configuration or OS.

I do really appreciate any ideas in this matter.

Update

I also found this thread, which is a bit confusing, but it seems to me that onboard VGA and DP should be supported.

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  • Did you try DP to HDMI? I am trying to troubleshooting the display for DP port as well. I am using a cable of DP-HDMI and it doesn't work.
    – Jon.W
    Commented Mar 6, 2018 at 19:50
  • @jz.Wang no. I didnt. My displays are lacking of HDMI input. Commented Mar 7, 2018 at 21:51

1 Answer 1

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as soon as I posted the questions I've found the solution.

I was using an adaptor DP to VGA which is not supported!

Check Dell Knowledge Base: Unable To Configure Dual Monitors for more info.

In the end I've changed it to DVI which was supported by my monitor as well and it works instantly.

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