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qt.qpa.xcb: could not connect to display qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

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  • Y Yash_r

    @jsulm
    I am unable to post the entire log here because of the post word limit, so, I have saved the entire log to a txt file file with the QT_DEBUG_PLUGINS=1

    I hope this helps understand the problem better and maybe, help getting a solution to the issue...!

    PS: I am using a 3rd party website, since I couldn't upload the file directly here.

    Regards,
    Yash

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #4

    @Yash_r My Firefox refuses to open this URL.
    Did you search for errors in the output?

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    hskoglundH 1 Reply Last reply
    0
    • jsulmJ jsulm

      @Yash_r My Firefox refuses to open this URL.
      Did you search for errors in the output?

      hskoglundH Online
      hskoglundH Online
      hskoglund
      wrote on last edited by
      #5

      Hi, the good news is that I can read the log, the bad news is that it shows successful launches of Qt Creator (so Qt Creator works fine) but nowhere is textLabel_Ex mentioned :-(

      Y 1 Reply Last reply
      0
      • hskoglundH hskoglund

        Hi, the good news is that I can read the log, the bad news is that it shows successful launches of Qt Creator (so Qt Creator works fine) but nowhere is textLabel_Ex mentioned :-(

        Y Offline
        Y Offline
        Yash_r
        wrote on last edited by
        #6

        @hskoglund @jsulm @SGaist
        textLabel_Ex is not the only program being affected like this. The error is present while deploying any app to the Beaglebone black.

        Is there anything else that i can do to share some more information which can help you to understand the issue better?

        Regards,
        Yash

        1 Reply Last reply
        0
        • hskoglundH Online
          hskoglundH Online
          hskoglund
          wrote on last edited by hskoglund
          #7

          Hi, a log from an unsuccessful launch of any Qt app on the Beaglebone black.

          Y 2 Replies Last reply
          0
          • hskoglundH hskoglund

            Hi, a log from an unsuccessful launch of any Qt app on the Beaglebone black.

            Y Offline
            Y Offline
            Yash_r
            wrote on last edited by Yash_r
            #8

            @hskoglund
            I have a cross-compile setup here, building the Qt apps on an ubuntu 20.04 LTS machine and deploying the built app to the Beaglebone Black (running Debian Bullseye distro) and checking the app working over a vnc connection.

            Also, the app is not running in the qtcreator app, but is copied onto the BBB's /opt/ directory and the app can be executed manually from there.

            @hskoglund said in qt.qpa.xcb: could not connect to display qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

            a log from an unsuccessful launch of any Qt app on the Beaglebone black.

            So, any particular process on how to get that particular log?

            1 Reply Last reply
            0
            • hskoglundH hskoglund

              Hi, a log from an unsuccessful launch of any Qt app on the Beaglebone black.

              Y Offline
              Y Offline
              Yash_r
              wrote on last edited by
              #9

              @hskoglund @jsulm @SGaist
              Checking to see if anyone can further assist me with this issue as I am not able to debug the code from the Qt creator because of this very issue.

              I would be able to provide any more information needed to better understand the issue.

              1 Reply Last reply
              0
              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #10

                How many Qt versions do you have on your device ?

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                Y 1 Reply Last reply
                0
                • SGaistS SGaist

                  How many Qt versions do you have on your device ?

                  Y Offline
                  Y Offline
                  Yash_r
                  wrote on last edited by
                  #11

                  @SGaist
                  As far as i can see in the Options -> Kits, i have only 5.12.1 version configured for Beaglebone black.
                  (29738877-76be-4d6e-808d-fff04f0664e2-image.png

                  1 Reply Last reply
                  0
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #12

                    I meant on the device itself.

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                    Y 1 Reply Last reply
                    1
                    • SGaistS SGaist

                      I meant on the device itself.

                      Y Offline
                      Y Offline
                      Yash_r
                      wrote on last edited by
                      #13

                      @SGaist
                      I am using the latest Debian Bullseye distro which is pretty much the latest available (updated from Debian Buster as a clean install).

                      So, the device is new and only has the Qt5,12,1,

                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #14

                        And it's the one you cross-compiled ?

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                        Y 1 Reply Last reply
                        0
                        • SGaistS SGaist

                          And it's the one you cross-compiled ?

                          Y Offline
                          Y Offline
                          Yash_r
                          wrote on last edited by
                          #15

                          @SGaist
                          Yes, Qt5.12.1 is the only version i have installed on my PC and using it for cross-compilation to the BBB.

                          Is there something that I am missing or might've messed up?

                          1 Reply Last reply
                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #16

                            When starting directly on the BBB, do you use the same backend ?

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                            Y 1 Reply Last reply
                            0
                            • SGaistS SGaist

                              When starting directly on the BBB, do you use the same backend ?

                              Y Offline
                              Y Offline
                              Yash_r
                              wrote on last edited by
                              #17

                              @SGaist said in qt.qpa.xcb: could not connect to display qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                              do you use the same backend ?

                              Same backend?? Can you tell me what backend is being asked about?

                              @SGaist said in qt.qpa.xcb: could not connect to display qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                              When starting directly on the BBB

                              Also I cannot directly start Qtcreator on BBB, since i don't have it installed on the BBB, and only use the cross-compilation on the ubuntu system to compile and deploy the app to the BBB (and nothing else)....don't know if that makes sense.

                              1 Reply Last reply
                              0
                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #18

                                Backed: xcb, eglfs, etc.

                                No need for Qt Creator on your target, I meant literally starting your application on it, for example through the command line.

                                Interested in AI ? www.idiap.ch
                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                Y 1 Reply Last reply
                                0
                                • SGaistS SGaist

                                  Backed: xcb, eglfs, etc.

                                  No need for Qt Creator on your target, I meant literally starting your application on it, for example through the command line.

                                  Y Offline
                                  Y Offline
                                  Yash_r
                                  wrote on last edited by
                                  #19

                                  @SGaist
                                  When i run, any app on the target, from the terminal, I see the following output on the terminal:
                                  e59ef0f5-fb2a-4b54-a9da-c79c34103a09-image.png

                                  1 Reply Last reply
                                  0
                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #20

                                    So it looks like your X server installation is incomplete to run Qt applications with the xcb backend. I would start by fixing that.

                                    Interested in AI ? www.idiap.ch
                                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                    Y 1 Reply Last reply
                                    1
                                    • SGaistS SGaist

                                      So it looks like your X server installation is incomplete to run Qt applications with the xcb backend. I would start by fixing that.

                                      Y Offline
                                      Y Offline
                                      Yash_r
                                      wrote on last edited by
                                      #21

                                      @SGaist

                                      Can you help me with how to fix the incomplete X server installation? Or help provide some resource which can be helpful?

                                      jsulmJ 1 Reply Last reply
                                      0
                                      • Y Yash_r

                                        @SGaist

                                        Can you help me with how to fix the incomplete X server installation? Or help provide some resource which can be helpful?

                                        jsulmJ Offline
                                        jsulmJ Offline
                                        jsulm
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #22

                                        @Yash_r Install libxcb-xkb1 package on your target device

                                        https://forum.qt.io/topic/113070/qt-code-of-conduct

                                        Y 1 Reply Last reply
                                        0
                                        • jsulmJ jsulm

                                          @Yash_r Install libxcb-xkb1 package on your target device

                                          Y Offline
                                          Y Offline
                                          Yash_r
                                          wrote on last edited by Yash_r
                                          #23

                                          @jsulm
                                          That package is already installed according to the apt-install as can be seen in the below image:
                                          deca5e9d-2775-47f2-a1c0-1723b737d0d6-image.png

                                          Also, when i try to run the app (as debian user) from the terminal, i get the following error:
                                          0b37aee9-60d6-40e0-bded-9ec3c3eea984-image.png

                                          jsulmJ 1 Reply Last reply
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