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VIM3/3L QT5
Introduction
This document is mainly QT5 library. You will learn how to install QT5, set it up and test it.
The default QT packages from Ubuntu official are built with OpenGL Desktop support, but for VIMs, there don’t have Mali GPU driver under X11, so you can’t use QT with GPU.In order to use QT with GPU (fbdev), we have rebuilt the QT packages with eglfs Mali GPU support.
- Only support Framebuffer Console mode.
- Install this version of library will break some official packages which depend on this library.
- The QT5 with eglfs Mali GPU (fbdev) only supports Ubuntu 20.04 Linux 4.9.
System Configuration
Please make sure you use the latest image, if not please follow Upgrade The System to upgrade your system.
Install QT5 packages.
$ sudo apt update $ sudo apt install qt5-default qtbase5-examples $ mkdir /tmp/qt5 $ cd /tmp/qt5 $ wget https://dl.khadas.com/repos/debs/vim3/focal/qt5/libqt5gui5_5.12.8%2Bdfsg-0ubuntu2_arm64.deb $ sudo dpkg -i libqt5gui5_5.12.8+dfsg-0ubuntu2_arm64.deb
Demonstrate
Switch to Framebuffer mode.For desktop image, you can use Ctrl+Alt+F1 to switch to framebuffer console mode.
Setup the environment variables below.
$ export QT_QPA_PLATFORM=eglfs $ export QT_QPA_EGLFS_INTEGRATION=eglfs_mali
Run test:
$ /usr/lib/aarch64-linux-gnu/qt5/examples/opengl/qopenglwidget/qopenglwidget
If every thing works you will see the QT demo running on screen.
For more demos, please check /usr/lib/aarch64-linux-gnu/qt5/examples.
Troubleshooting
When you install such version of library you will break some packages (such as qtcreator) which depend on the original library, if you don’t want to break the packages you can follow the instructions below to install the original QT5 library.
$ wget http://ports.ubuntu.com/pool/universe/q/qtbase-opensource-src/libqt5gui5_5.12.8+dfsg-0ubuntu1_arm64.deb $ sudo dpkg -i libqt5gui5_5.12.8+dfsg-0ubuntu1_arm64.deb