This page contains frequently asked questions/problems and how to fix them.
How do I check whether I run appman in multi-process mode ?
Either start the application-manager with
--verbose and look for the output
WindowManager: running in Wayland mode, or simply start an application and make sure you can see at least one appman-launcher-qml process running.
How do I check why my appman doesn't support multi-process mode ?
Check the configure output of appman (Most likely you are missing the qtwayland module).
My applications are running slow within appman. What can I do ?
Check whether your applications run with hardware acceleration.
How do I check whether my applications use hardware-acceleration ?
Run appman with the environment variable QSG_INFO=1. You should see output looking similar this, when starting an application:
[DBG | qt.scenegraph.general | c.p.music] Using sg animation driver [DBG | qt.scenegraph.general | c.p.music] Animation Driver: using vsync: 16.95 ms [DBG | qt.scenegraph.general | c.p.music] texture atlas dimensions: 1024x1024 [DBG | qt.scenegraph.general | c.p.music] R/G/B/A Buffers: 8 8 8 8 [DBG | qt.scenegraph.general | c.p.music] Depth Buffer: 24 [DBG | qt.scenegraph.general | c.p.music] Stencil Buffer: 8 [DBG | qt.scenegraph.general | c.p.music] Samples: 0 [DBG | qt.scenegraph.general | c.p.music] GL_VENDOR: VMware, Inc. [DBG | qt.scenegraph.general | c.p.music] GL_RENDERER: llvmpipe (LLVM 5.0, 256 bits) [DBG | qt.scenegraph.general | c.p.music] GL_VERSION: 3.0 Mesa 17.3.0
If GL_RENDERER is "llvmpipe" you are using software-rendering for your wayland clients.
Note: You will also get this information output for the system-ui itself - make sure to look at the information table that has the application's id in the prefix (in the example above,
How do I turn on hardware-accerlation ?
This depends on your hardware and the operating system:
In general you need to make sure you have the correct drivers installed:
- NVIDIA on ubuntu/debian you need: nvidia-egl-wayland-icd
- Intel on ubuntu/debian you need: libwayland-egl1-mesa
On desktop systems make sure your Qt is configured to use at least OpenGL ES2/ES3 and NOT Desktop OpenGL. Check for the following configure summary line in Qt itself:
OpenGL ES 2.0 ........................ yes
You can force Qt to use Opengl ES2 by using the "--opengl es2" configure option.
Make sure the wayland-egl integration plugin is built: Check for the following file: <QT_DIR>/plugins/wayland-graphics-integration-client/libwayland-egl.so
If that is not available, check the QtWayland configure summary and make sure it does get built.
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