Zotac ZBOX CI323-Nano-U goes blank when second display is attached (Fedora 27 Cinnamon X)

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The Zotac CI323 has DisplayPort, HDMI, and VGA outputs.

It is running Fedora 27 Cinnamon with X.
lspci -v shows an x5-E8000/J3xxx/N3xxx with kernel module i915 in use



Any single digital display connection works on either the DisplayPort or the HDMI port. Either may be shown as a single HDMI of the same number (i.e. xrandr shows HDMI3 for me when the display cable is in one port or the other).



Connecting two displays simultaneously causes both of the displays to go into power save.
When either display cable is removed, the remaining display goes active again.



It should automatically reconfigure for both displays.



(I solved this and am going to post my answer below)







share|improve this question
























    up vote
    0
    down vote

    favorite












    The Zotac CI323 has DisplayPort, HDMI, and VGA outputs.

    It is running Fedora 27 Cinnamon with X.
    lspci -v shows an x5-E8000/J3xxx/N3xxx with kernel module i915 in use



    Any single digital display connection works on either the DisplayPort or the HDMI port. Either may be shown as a single HDMI of the same number (i.e. xrandr shows HDMI3 for me when the display cable is in one port or the other).



    Connecting two displays simultaneously causes both of the displays to go into power save.
    When either display cable is removed, the remaining display goes active again.



    It should automatically reconfigure for both displays.



    (I solved this and am going to post my answer below)







    share|improve this question






















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      The Zotac CI323 has DisplayPort, HDMI, and VGA outputs.

      It is running Fedora 27 Cinnamon with X.
      lspci -v shows an x5-E8000/J3xxx/N3xxx with kernel module i915 in use



      Any single digital display connection works on either the DisplayPort or the HDMI port. Either may be shown as a single HDMI of the same number (i.e. xrandr shows HDMI3 for me when the display cable is in one port or the other).



      Connecting two displays simultaneously causes both of the displays to go into power save.
      When either display cable is removed, the remaining display goes active again.



      It should automatically reconfigure for both displays.



      (I solved this and am going to post my answer below)







      share|improve this question












      The Zotac CI323 has DisplayPort, HDMI, and VGA outputs.

      It is running Fedora 27 Cinnamon with X.
      lspci -v shows an x5-E8000/J3xxx/N3xxx with kernel module i915 in use



      Any single digital display connection works on either the DisplayPort or the HDMI port. Either may be shown as a single HDMI of the same number (i.e. xrandr shows HDMI3 for me when the display cable is in one port or the other).



      Connecting two displays simultaneously causes both of the displays to go into power save.
      When either display cable is removed, the remaining display goes active again.



      It should automatically reconfigure for both displays.



      (I solved this and am going to post my answer below)









      share|improve this question











      share|improve this question




      share|improve this question










      asked Feb 9 at 1:42









      Bruce Benson

      111




      111




















          1 Answer
          1






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          This worked for me:



          1. create an /etc/X11/xorg.conf.d/20-intel.conf, containing:

          Section "Device"
          Identifier "Intel Graphics"
          Driver "Intel"
          Option "ReprobeOutputs" "true"
          EndSection



          1. ...then restart X.
            That's it.


          2. You may need to open the display settings to fix the geometry. Also, it may detect 3 displays (when 2 are connected), one of which is a duplicative entry that can be disabled.


          (sidebar: I did not need to add module options to i915. I was considering playing with lvds_channel_mode, use modinfo -p i915 to see.)






          share|improve this answer




















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            up vote
            1
            down vote













            This worked for me:



            1. create an /etc/X11/xorg.conf.d/20-intel.conf, containing:

            Section "Device"
            Identifier "Intel Graphics"
            Driver "Intel"
            Option "ReprobeOutputs" "true"
            EndSection



            1. ...then restart X.
              That's it.


            2. You may need to open the display settings to fix the geometry. Also, it may detect 3 displays (when 2 are connected), one of which is a duplicative entry that can be disabled.


            (sidebar: I did not need to add module options to i915. I was considering playing with lvds_channel_mode, use modinfo -p i915 to see.)






            share|improve this answer
























              up vote
              1
              down vote













              This worked for me:



              1. create an /etc/X11/xorg.conf.d/20-intel.conf, containing:

              Section "Device"
              Identifier "Intel Graphics"
              Driver "Intel"
              Option "ReprobeOutputs" "true"
              EndSection



              1. ...then restart X.
                That's it.


              2. You may need to open the display settings to fix the geometry. Also, it may detect 3 displays (when 2 are connected), one of which is a duplicative entry that can be disabled.


              (sidebar: I did not need to add module options to i915. I was considering playing with lvds_channel_mode, use modinfo -p i915 to see.)






              share|improve this answer






















                up vote
                1
                down vote










                up vote
                1
                down vote









                This worked for me:



                1. create an /etc/X11/xorg.conf.d/20-intel.conf, containing:

                Section "Device"
                Identifier "Intel Graphics"
                Driver "Intel"
                Option "ReprobeOutputs" "true"
                EndSection



                1. ...then restart X.
                  That's it.


                2. You may need to open the display settings to fix the geometry. Also, it may detect 3 displays (when 2 are connected), one of which is a duplicative entry that can be disabled.


                (sidebar: I did not need to add module options to i915. I was considering playing with lvds_channel_mode, use modinfo -p i915 to see.)






                share|improve this answer












                This worked for me:



                1. create an /etc/X11/xorg.conf.d/20-intel.conf, containing:

                Section "Device"
                Identifier "Intel Graphics"
                Driver "Intel"
                Option "ReprobeOutputs" "true"
                EndSection



                1. ...then restart X.
                  That's it.


                2. You may need to open the display settings to fix the geometry. Also, it may detect 3 displays (when 2 are connected), one of which is a duplicative entry that can be disabled.


                (sidebar: I did not need to add module options to i915. I was considering playing with lvds_channel_mode, use modinfo -p i915 to see.)







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Feb 9 at 1:48









                Bruce Benson

                111




                111






















                     

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