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qt gui on rpi

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  • linaL Offline
    linaL Offline
    lina
    wrote on last edited by
    #1

    I write a gui with qt. I run it on rpi2 touchscreen lcd(3.2 inch). when it executes , it's not stable on lcd and it disappear with each click. sometimes gui is disappeared totaly and sometimes part of touch click is disappeared. how can I fix this problem?

    miclandM 1 Reply Last reply
    0
    • linaL lina

      I write a gui with qt. I run it on rpi2 touchscreen lcd(3.2 inch). when it executes , it's not stable on lcd and it disappear with each click. sometimes gui is disappeared totaly and sometimes part of touch click is disappeared. how can I fix this problem?

      miclandM Offline
      miclandM Offline
      micland
      wrote on last edited by
      #2

      @lina
      I had similiar problems which could be solved in my case by extending the GPU memory (via raspi-config, set it to 265 MB instead of the default 64 MB).

      linaL 1 Reply Last reply
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      • miclandM micland

        @lina
        I had similiar problems which could be solved in my case by extending the GPU memory (via raspi-config, set it to 265 MB instead of the default 64 MB).

        linaL Offline
        linaL Offline
        lina
        wrote on last edited by
        #3

        @micland
        Thank you for your response. Unfortunately, changing GPU memory to 256MB didn't solve the problem :(

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        • sneubertS Offline
          sneubertS Offline
          sneubert
          wrote on last edited by
          #4

          Hi lina,

          which platform plugin do you use? xcb, eglfs, linuxfb?
          Are you running an xserver?

          linaL 1 Reply Last reply
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          • linaL Offline
            linaL Offline
            lina
            wrote on last edited by
            #5
            This post is deleted!
            1 Reply Last reply
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            • sneubertS sneubert

              Hi lina,

              which platform plugin do you use? xcb, eglfs, linuxfb?
              Are you running an xserver?

              linaL Offline
              linaL Offline
              lina
              wrote on last edited by
              #6

              @sneubert

              hi Sneubert
              I'm using linuxfb plugin and runing xserver

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              • sneubertS Offline
                sneubertS Offline
                sneubert
                wrote on last edited by sneubert
                #7

                Ok, so just shut down your xserver or use xcb.
                If using linuxfb and running a xserver, both will write to the framebuffer, which cause the flickering.
                And with edev both will respond to touch events.

                linaL 1 Reply Last reply
                1
                • sneubertS sneubert

                  Ok, so just shut down your xserver or use xcb.
                  If using linuxfb and running a xserver, both will write to the framebuffer, which cause the flickering.
                  And with edev both will respond to touch events.

                  linaL Offline
                  linaL Offline
                  lina
                  wrote on last edited by
                  #8

                  @sneubert
                  thank you for your response. I try it.

                  1 Reply Last reply
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