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Multiple screens on Qt Automotive with iMX6
Isaias last edited by
Following Building Your Own Embedded Linux Image, I was able to create a Qt Automotive image and the Neptune demo works fine
But now I would like to have two screen working together with the Neptune demo.
I modified my local.conf to remove X11 and wayland in order to work only with EGLFS
DISTRO_FEATURES_remove = "X11 wayland"
I also modified my u-boot enviroment variables to set up my two screens (HDMI and LVDS)
setenv vidargs 'video=mxcfb0:dev=ldb video=mxcfb1:dev=hdmi,1280x1024M@60,if=RGB24 video=mxcfb2:off video=mxcfb3:off fbmem=32M'
I can see the neptune in my HDMI monitor (fb2) but a black in my LVDS screen (fb0)
but when I execute:
cat /dev/urandom > /dev/fb0
it does work, I can see the random pixels being painted
But in my app when I execute:
QList<QScreen *> screens = QGuiApplication::screens(); printf("Screens = %d\n", screens.count());
I only get one screen and when I run qtdiag I get the next:
Screens: 1, High DPI scaling: inactive # 0 "" Depth: 16 Primary: yes Manufacturer: Model: Serial number: Geometry: 1920x720+0+0 Available: 1920x720+0+0 Physical size: 487.68x182.88 mm Refresh: 62 Hz Power state: 0 Physical DPI: 100,100 Logical DPI: 100,100 Subpixel_None DevicePixelRatio: 1 Pixel density: 1 Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0
It looks like Qt Embedded is only detecting my first screen (fbo)
Does somebody has had experience with multiple screen working together?
Am I missing some configuration file?
My intention was to configre neptune to something like this: Neptune 3 UI - Configuring Screens on Embedded Linux
My HW is:
- Apalis iMX6
- Apalis Evaluation Board
root@b2qt-apalis-imx6:~# uname -a Linux b2qt-apalis-imx6 4.1.44-2.7.5+g18717e2b1ca9 #1 SMP Fri Feb 22 10:41:34 CST 2019 armv7l armv7l armv7l GNU/Linux
tomasz3dk last edited by
Isaias last edited by
I can run the Qt Neptune demo or other Qt app in one screen or the other, even both at the same time, setting QT_QPA_EGLFS_FB to the correct fb before executing the app
But my final intention is to modify the Neptune configuration to work something like this Neptune 3 UI - Configuring Screens on Embedded Linux
It looks like I am missing to set up a configuration for the Qt Embedded Stack to detect both screens but I don't know.
scbyun last edited by
I have the same problem.
Please comment if you know how to solve it.