How to run over VNC in X11 Mode (xcb) ?

[cerw]

Hi

I am have VNC server running on PI2 and trying to get full GUI running however when run from terminal or from menu nothing happens. I am using the offical image + pixel wm. Olad and qlcplus in deamon mode works.

Output:

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pi@raspberrypi:~ $ qlcplus --platfom xcb
[9;0]Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

Q Light Controller Plus version 4.10.5b
This program is licensed under the terms of the Apache 2.0 license.

Thank you

Petr

[mcallegari]

As written in chapter 10 of the provided PDF, the correct option is "-platform xcb"
Single dash, not double

[cerw]

Sorry my bad, I tried that too, i just copied wrong command..

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pi@raspberrypi:~ $ qlcplus -platform xcb
This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, xcb.

Reinstalling the application may fix this problem.
Aborted

[mcallegari]

Which Qt version are you using ?
You need to use my version, and, again, follow the instructions of chapter 10

[cerw]

I am using your image, no custom image.

[cerw]

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root@raspberrypi:~# ldd /usr/bin/qlcplus
        linux-vdso.so.1 (0x7edc6000)
        /usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f7b000)
        libqlcplusengine.so.1 => /usr/lib/libqlcplusengine.so.1 (0x76e12000)
        libqlcplusui.so.1 => /usr/lib/libqlcplusui.so.1 (0x76aba000)
        libqlcpluswebaccess.so.1 => /usr/lib/libqlcpluswebaccess.so.1 (0x76a64000)
        libQt5Widgets.so.5 => /opt/qt5-rpi/lib/libQt5Widgets.so.5 (0x7653a000)
        libQt5Gui.so.5 => /opt/qt5-rpi/lib/libQt5Gui.so.5 (0x760e1000)
        libQt5Script.so.5 => /opt/qt5-rpi/lib/libQt5Script.so.5 (0x75ef4000)
        libQt5Core.so.5 => /opt/qt5-rpi/lib/libQt5Core.so.5 (0x759eb000)
        libGLESv2.so => /opt/vc/lib/libGLESv2.so (0x759c6000)
        libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0x7599e000)
        libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x758c2000)
        libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x75846000)
        libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0x75819000)
        libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x756d8000)
        libasound.so.2 => /usr/lib/arm-linux-gnueabihf/libasound.so.2 (0x755fe000)
        libudev.so.1 => /lib/arm-linux-gnueabihf/libudev.so.1 (0x755e1000)
        libfftw3.so.3 => /usr/lib/arm-linux-gnueabihf/libfftw3.so.3 (0x754e1000)
        libQt5Multimedia.so.5 => /opt/qt5-rpi/lib/libQt5Multimedia.so.5 (0x75409000)
        libQt5Network.so.5 => /opt/qt5-rpi/lib/libQt5Network.so.5 (0x75315000)
        libQt5MultimediaWidgets.so.5 => /opt/qt5-rpi/lib/libQt5MultimediaWidgets.so.5 (0x752ff000)
        libz.so.1 => /lib/arm-linux-gnueabihf/libz.so.1 (0x752d8000)
        libpng12.so.0 => /lib/arm-linux-gnueabihf/libpng12.so.0 (0x752a7000)
        libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x75294000)
        libgthread-2.0.so.0 => /usr/lib/arm-linux-gnueabihf/libgthread-2.0.so.0 (0x75282000)
        libglib-2.0.so.0 => /lib/arm-linux-gnueabihf/libglib-2.0.so.0 (0x7517f000)
        librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0x75168000)
        /lib/ld-linux-armhf.so.3 (0x54b11000)
        libEGL.so => /opt/vc/lib/libEGL.so (0x7512e000)
        libbcm_host.so => /opt/vc/lib/libbcm_host.so (0x75107000)
        libvchiq_arm.so => /opt/vc/lib/libvchiq_arm.so (0x750f1000)
        libvcos.so => /opt/vc/lib/libvcos.so (0x750d7000)
        libQt5OpenGL.so.5 => /opt/qt5-rpi/lib/libQt5OpenGL.so.5 (0x75092000)
        libpcre.so.3 => /lib/arm-linux-gnueabihf/libpcre.so.3 (0x7501e000)
        

[mcallegari]

ldd on qlcplus is not the point.

You need to do ldd on the Qt XCB platform plugin. Going by memory it should be in

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/opt/qt5-rpi/plugins/platforms//libqxcb.so 

or something like that.
Most likely you will see a broken dependency that you will need to install.

[frunk]

Most likely you will see a broken dependency that you will need to install.

MANY MANY broken dependencies as the basic install does not bring in anything needed for xcb to work with QT5...

As a total n00b with dangerous levels of Google access along with some trial and error I got there in the end!

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sudo apt-get install libxcb-render-util0
sudo apt-get install libxcb-image0
sudo apt-get install libxcb-icccm4
sudo apt-get install libxcb-randr0
sudo apt-get install libxcb-xkb1
sudo apt-get install libxcb-keysyms1
sudo apt-get install libxkbcommon-x11-0
sudo apt-get install libxcb-xfixes0
sudo apt-get install libxcb-xinerama0

EDIT: I did pop a new thread in this section detailing what I did to get this working from beginning to end: viewtopic.php?f=7&t=10942

[cerw]

Yes had to install many libxcb* packages and now all works! thanks

[mcallegari]

The xcb packages should be mentioned in chapter 10 of the PDF guide (for the 3rd time)
If there's some missing, please let me know, so I can add them to the PDF and avoid other people struggling with this

[angelaametz]

I advise you to try another software for remote access. I have been using software for a long time from this company https://yumdownload.com/realvnc. They provide free support to their users, which can not but rejoice. This resource is convenient for every PC user, as here you will find everything you need in one place.