No cursor on Qt5 under linuxfb plugin
I have Qt5.1.0 running on a x86 embedded system, no xserver, no wayland. So I tried the linuxfb platform with the "evdevmouse" and "evdevkeyboard" plugins.
It works quite well, apart from the fact that I can not see the mouse cursor. If I am lucky I can click the buttons and the application behaves as expected.
I did try with
in different variations without success.
Here is my command line to start the application:
@/demo-app -platform linuxfb -plugin evdevkeyboard:/dev/input/event0 -plugin evdevmouse:/dev/input/event1@
Any Idea how to get the cursor visible?
Thanks for any response!
Could you solve your problem?
I just upgraded our software stack to QT 5.1.x. I was able to use mouse input with QT 4.8 and tslib without any problems but it doesn't seem to work with QT5.1.x.
I use the default examples in qt to test input device support on our embedded system and I haven't been able to find a line of code which would disable the cursor in the examples. Therefore it must to be a wrong configuration...
EDIT: I just realized that in my case the moues also works. The cursor is just now shown.
I have exactly the same problem with Qt5.2.0-alpha, native build on a Beaglebone black (ubuntu distro): I don't see the mouse pointer but the mouse is working...
I used : ./xyz -platform linuxfb -plugin EvdevMouse -plugin EvdevKeyboard
(keyboard is working).
Same problem also on my Qt5.1.1 build
I visited die DevDays in Berlin and a developer mentioned in a presentation that this behavior can be modified by manipulating the QT_QPA_EGLFS_CURSOR environment variable. You also have to create a json-file which specifies all the settings, but currently there is no documentation about this, therefor you'd have to check the source-code: https://qt.gitorious.org/qt/qtbase/source/3d0af143ca51af0a3cbd81a794e6726992f9a86b:src/plugins/platforms/eglfs/qeglfscursor.cpp
There is no mouse cursor visible with linuxfb because cursor support is somewhat incomplete in this plugin. I'm cooking up a patch for this so hopefully it will get corrected in 5.2 final.
To complete answer of Agocs, you may follow this bug:
You may found patch written by Agos there:
Unfortunately, it's look like it's not included in Qt5.2.0.
The cursor fix is in 5.2.0. However, linuxfb has another bug in 5.2.0 which often prevents windows from showing up properly. It has recently been fixed ( https://codereview.qt-project.org/#change,74138 ) and the fix is coming in 5.2.1.
[quote author="agocs" date="1388512087"]The cursor fix is in 5.2.0. However, linuxfb has another bug in 5.2.0 which often prevents windows from showing up properly. It has recently been fixed ( https://codereview.qt-project.org/#change,74138 ) and the fix is coming in 5.2.1.
I tried an application (http://qt-project.org/forums/viewthread/47066/) with linuxfb and Qt 5.3.1 on Gentoo Linux, but there is no mouse cursor visible on framebuffer. If a Qpushbutton fills the whole screen, clicking the mouse aktivates the button, so the move seems to work. Is there a special command line option for configure to enable showing the mouse cursor?
I figured out that this is not related to QT 5.3.1. If I connect another mouse e.g. with cable the mouse cursor appears as expected if I choose the correct event device (/dev/input/...). But some wireless mice and touchpads are not working well. But this must be related to the evdev support(?).