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    Solved Problem of graphics card after SAMSON installation on Ubuntu 18.04 (Intel processors)

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    • DmitriyMarin
      DmitriyMarin last edited by DmitriyMarin

      @Robert

      I think, it might be connected to the Wayland display being used instead of Xorg (see: https://forum.samson-connect.net/topic/37/installing-or-running-samson-on-ubuntu-17-04-and-later-versions). I would suggest you to try installing Xorg and disabling Wayland display.

      See, e.g.: https://linuxconfig.org/how-to-disable-wayland-and-enable-xorg-display-server-on-ubuntu-18-04-bionic-beaver-linux

      Dmitriy,
      The SAMSON Team, https://s-c.io

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      • R
        Robert last edited by

        Thank you Dmitryi, I had not seen that trick of disabling Wayland display. I tried and reboot but nothing changed sor SAMSON or VMD display. I don't know how to be sure that Xorg display is used .. When I type "Xorg" (or "Xorg -version") in the terminal I get :

        /usr/lib/xorg/Xorg.wrap: Only console users are allowed to run the X server

        However when I type "sudo Xorg -version", I get :

        X.Org X Server 1.19.6
        Release Date: 2017-12-20
        X Protocol Version 11, Revision 0
        Build Operating System: Linux 4.4.0-138-generic x86_64 Ubuntu
        Current Operating System: Linux pl365-pro 4.15.0-47-generic #50-Ubuntu SMP Wed Mar 13 10:44:52 UTC 2019 x86_64
        Kernel command line: BOOT_IMAGE=/vmlinuz-4.15.0-47-generic root=/dev/mapper/VGsys-root ro
        Build Date: 25 October 2018 04:11:27PM
        xorg-server 2:1.19.6-1ubuntu4.2 (For technical support please see http://www.ubuntu.com/support)
        Current version of pixman: 0.34.0
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.

        I don't know if it is normal, but I don't have any xorg.conf file in /etc/X11/ (as should be the case according to https://doc.ubuntu-fr.org/xorg). Maybe I should create and edit one such file in that precise directory ?

        When I type "locate xorg.conf", I get :

        /usr/share/X11/xorg.conf.d
        /usr/share/X11/xorg.conf.d/10-amdgpu.conf
        /usr/share/X11/xorg.conf.d/10-quirks.conf
        /usr/share/X11/xorg.conf.d/10-radeon.conf
        /usr/share/X11/xorg.conf.d/40-libinput.conf
        /usr/share/X11/xorg.conf.d/70-wacom.conf
        /usr/share/doc/xserver-xorg-video-intel/xorg.conf
        /usr/share/man/man5/xorg.conf.5.gz
        /usr/share/man/man5/xorg.conf.d.5.gz

        Maybe I should type "sudo dpkg-reconfigure -phigh xserver-xorg" to reconfigure automatically Xorg, as suggested in ttps://doc.ubuntu-fr.org/xorg ?

        Thank you.
        Robert

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        • DmitriyMarin
          DmitriyMarin last edited by

          Could you, please, check whether Wayland or X11 display is used, e.g. (please, check for the proper way on Ubuntu):

          echo $XDG_SESSION_TYPE

          or

          cat /etc/X11/default-display-manager

          or

          loginctl show-session $(loginctl | grep $(whoami) | awk '{print $1}') -p Type

          If your system is using Xorg and you still experience problems with OpenGL you may try switching to the lightdm display manager (please, check for Ubuntu 18.04):

          sudo dpkg-reconfigure lightdm
sudo apt-get install lightdm

          Dmitriy,
          The SAMSON Team, https://s-c.io

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          • R
            Robert last edited by

            Thank you Dmitryi.

            cat /etc/X11/default-display-manager
            gives me :

            /usr/sbin/gdm3

            echo $XDG_SESSION_TYPE
            gives me :
            x11

            loginctl show-session 2 -p Type

            gives me :

            Type=x11

            So I think x11 is turned on and not Wayland, so it seems OK.

            I then installed lightdm and replaced gdm3 by lightdm as a display manager, thus :

            cat /etc/X11/default-display-manager

            gives me now :

            /usr/sbin/lightdm

            I tried launching SAMSON but nothing changed, maybe I have to reboot and re-try..
            Thanks,
            Robert

            DmitriyMarin 1 Reply Last reply Reply Quote 0
            • DmitriyMarin
              DmitriyMarin @Robert last edited by

              @robert
              Yes, could you, please, try rebooting your system.

              Dmitriy,
              The SAMSON Team, https://s-c.io

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              • R
                Robert last edited by

                Hi Dmitryi, thanks, I tried rebooting, and having the new lightdm display instead of gdm3, but it didn't solve my problem for SAMSON nor for VMD...

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                • DmitriyMarin
                  DmitriyMarin last edited by

                  @Robert
                  Ok. I will try to read more on your issue and will come back to you once I have other ideas. If you solve the problem, could you, please, post the solution here. Thanks!

                  Dmitriy,
                  The SAMSON Team, https://s-c.io

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                  • R
                    Robert last edited by

                    Thanks a lot Dmitryi. I will keep looking for a solution also on my side.
                    I also asked for help of the support team at INRIA, so I let you know of course if I solve the problem. Best regards

                    1 Reply Last reply Reply Quote 1
                    • R
                      Robert last edited by

                      Hello Dmitriy, hope you are doing well, I solved my problem for VMD, it was my bad, I had installed the text mode version (I didn't realize I was doing such a mistake ...). The problem for SAMSON was thus completely decorrelated from that of VMD.
                      For SAMSON, the problem seems related to Ubuntu 18.04 Bionic and Intel i7 8th generation processors. It seems not to suffice that they support OpenGL 3.2. Another person in my team has almost the same computer , installed SAMSON and had the same graphics problem. When he activated his NVIDIA card, SAMSON worked (disgrafully, I don't have a NVIDIA card so I can't use this trick).

                      Maybe it can be due to the libraries SAMSON appeals when it was built, maybe it asks for more than available to these new INTEL processors ? Or it is a specific problem related to Ubuntu 18.04 Bionic with such INTEL processors ... ?
                      Best regards,
                      Robert

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                      • DmitriyMarin
                        DmitriyMarin last edited by

                        Hello @Robert ,
                        Thanks to your feedback, we have fixed the issue in SAMSON when using Intel integrated graphics processor. You can try installing SAMSON.

                        Dmitriy,
                        The SAMSON Team, https://s-c.io

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