按照在MPSoC上運行基于eglfs_kms的QT應用程序, 可以在MPSoC ZCU106單板的DP上基于eglfs_kms的運行QT應用程序。按照在VCUTRD 2020.1 里設置HDMI-TX顯示QT界面, 可以在MPSoC ZCU106單板的HDMI-Tx上基于X11的運行QT應用程序。在HDMI-Tx上，基于eglfs_kms的運行QT應用程序，遇到了下列兩個錯誤。

錯誤1

QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/var/volatile/tmp/runtime-root'
Setting framebuffer size is only available with DRM atomic API
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
Could not queue DRM page flip on screen HDMI1 (Invalid argument)
Could not queue DRM page flip on screen HDMI1 (Invalid argument)

錯誤2

QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/var/volatile/tmp/runtime-root'
Framebuffer size format is invalid.
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
Failed to commit atomic request (code=-22)

基于在VCUTRD 2020.1 里設置HDMI-TX顯示QT界面做更改后，執行下列命令，可以在MPSoC ZCU106單板的DP上基于eglfs_kms的運行QT應用程序。其中的$display_device和$connector_id，需要根據單板更改。display_device一般是類似a0070000.v_mix的格式，可以通過“dmesg | grep v_mix”查到。$connector_id，可以在“modetest -D $display_device”的輸出里查找， 也可以根據檢查Linux DRM顯示設備ID的腳本 得到。

update-alternatives --install /usr/lib/libMali.so.9.0 libmali /usr/lib/wayland/libMali.so.9.0 90

echo Y > /sys/module/xlnx_mixer/parameters/mixer_primary_enable

modetest -D $display_device -s $connector_id:1920x1080-60@AR24

killall Xorg
cat /run/kms.conf

export QT_QPA_PLATFOR
export QT_QPA_EGLFS_KMS_ATOMIC=1
export QT_QPA_EGLFS_INTEGRATIO
export QT_QPA_EGLFS_KMS_CONFI
export QT_QPA_EGLFS_DEBU
export QT_QPA_EGLFS_FORCE888=1

# chmod +x /run/qt5everywheredemo-1.0/QtDemo
# /run/qt5everywheredemo-1.0/QtDemo

ls -l /usr/share/examples/opengl/
/usr/share/examples/opengl/cube/cube
/usr/share/examples/opengl/textures/textures

如果運行失敗，有時執行“ctrl+c”還不能退出QT應用程序cube和textures，還需要執行命令“kill -9 ”, 或者“killall -9 cube”，才能讓其退出。

上述的/run/kms.conf內容如下：

{
  "device": "/dev/dri/card1",
  "hwcursor": false,
  "pbuffers": true,
  "outputs": [
    {
      "name": "HDMI",
      "mode": "1920x1080"
    }
  ]
}

審核編輯：湯梓紅