Changes between Version 5 and Version 6 of qt

Timestamp:

09/27/2021 07:40:40 PM (3 years ago)

Author:

Tim Harvey

Comment:

added configuration for lvds display

qt

@@ -25 +25 @@
 EGLFS forces the first top-level window (either a QWidget or a QQuickView) to become full screen and chosen to be the root widget window into which all other top-level widgets are composited. There are a number of env variables that can be used to configure EGLFS: see https://doc.qt.io/qt-5/embedded-linux.html#eglfs
 
-To use the EGLFS platform plugin with a KMS/DRM backend you need to define a screen configuration file customized to your board and display. For a Gateworks Ventana board with 1080p HDMI the configuration would be:
+To use the EGLFS platform plugin with a KMS/DRM backend you need to define a screen configuration file customized to your board and display.
+
+Examples:
+ * 1080p HDMI:
 {{{#!bash
-cat << EOF > /etc/ventana.json
+cat << EOF > /etc/eglfs_hdmi.json
 {
   "device": "/dev/dri/card1",
@@ -44 +47 @@
 }
 EOF
-export QT_QPA_EGLFS_KMS_CONFIG=/etc/ventana.json
+export QT_QPA_EGLFS_KMS_CONFIG=/etc/eglfs_hdmi.json
 export QT_QPA_EGLFS_ALWAYS_SET_MODE=1
 export QT_QPA_PLATFORM=eglfs
 }}}
+ * 1024x600 LVDS:
+{{{#!bash
+cat << EOF > /etc/eglfs_lvds.json
+{
+  "device": "/dev/dri/card1",
+  "hwcursor": false,
+  "pbuffers": true,
+  "outputs": [
+    {
+      "name": "HDMI-A-1",
+      "mode": "off"
+    },
+    {
+      "name": "LVDS-1",
+      "mode": "1024x600"
+    }
+  ]
+}
+EOF
+export QT_QPA_EGLFS_KMS_CONFIG=/etc/eglfs_lvds.json
+export QT_QPA_EGLFS_ALWAYS_SET_MODE=1
+export QT_QPA_PLATFORM=eglfs
+}}}
+
 
 In order to use EGLFS you need to be using a kernel with the etnaviv KMS/DRM driver enabled, libdrm (userspace lib to interface with Linux DRM drivers), and libmesa. Note that the etnaviv driver uses cma memory - if you get memory allocation errors when trying to run applications try increasing the cma memory via the kernel command-line.