embedded linux: Make LinuxFB first section more informative

Pick-to: 6.6 6.5 Change-Id: I34d94d6eb09c90213ad63aac3071930fcf86c755 Reviewed-by: Christian Strømme <[email protected]>
qt · Oct 2, 2023 · a8df4af · a8df4af
1 parent d75d85b
commit a8df4af
Showing 1 changed file with 10 additions and 4 deletions.
diff --git a/doc/src/platforms/emb-linux.qdoc b/doc/src/platforms/emb-linux.qdoc
@@ -234,10 +234,16 @@
   \section2 LinuxFB
 
   This plugin writes directly to the framebuffer via Linux's fbdev subsystem.
-  Only software-rendered content is supported. Note that on some setups
-  the display performance is expected to be limited.
-
-  However, since fbdev is being deprecated in the Linux kernel, the DRM dumb
+  Only software-rendered content is supported. Note that on some setups the
+  display performance is expected to be limited. To use Qt Quick applications
+  with this platform plugin, the \c software scenegraph backend must be used,
+  either by setting \c{QT_QUICK_BACKEND=software} in the environment, or by
+  calling \l{QQuickWindow::}{setGraphicsApi()} with
+  QSGRendererInterface::Software. QWidget applications, or QWindow with a
+  surface type of QSurface::RasterSurface, are supported, but this does not
+  include special widgets such as QOpenGLWidget.
+
+  As fbdev is being deprecated in the Linux kernel, DRM dumb
   buffer support is also available. To use it, set the
   \c QT_QPA_FB_DRM environment variable to a non-zero value. When set, provided
   that dumb buffers are supported by your system, legacy framebuffer devices