AM3354: Virtual keyboard is malfunctioning on AM335X (the problem of disappearing text)

Hello,

Could you please try running the following default Qt example and see if you are able to replicate the issue?

Regards,
Krunal

Dear Krunal,

Hello,and thanks for your response.

I have the same problem with "qtvirtualkeyboard-Qt example"for testing.

The method of use is as follows:

1. git clone github.com/.../qtvirtualkeyboard ,and sitch to the V5.11.3 branch (provide the source code in the attachment)

2. After compiling, execute qtvirtualkeyboard/tests/auto/inputpanel/tst_inputpanel.( in the attachment)

3. You can use the following script to execute.

================================================= ==
#!/bin/sh
### QT Environment Variables ###
export QT_QPA_PLATFORM=eglfs
export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS="rotate=0"
#set other Environmental variables
export DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/0/bus"
export QT_QPA_EGLFS_INTEGRATION="none"
export QT_QPA_EGLFS_KMS_CONFIG="/etc/qt5/eglfs_kms_cfg.json"
export QT_WAYLAND_SHELL_INTEGRATION="wl-shell"
export SSL_CERT_FILE="/etc/ssl/certs/ca-certificates.crt"
export WAYLAND_DISPLAY="wayland-0"
export XDG_CONFIG_HOME="/etc/"
export XDG_RUNTIME_DIR="/tmp/0-runtime-dir"
export XDG_SESSION_ID="c1"

./tst_inputpanel
=================================================

Regards,
Oliver

"qtvirtualkeyboard-Qt example"for testing.

"qtvirtualkeyboard-Qt example" source code6327.qtvirtualkeyboard.zip

Hello,

Thank you running the test and do you see same behavior with Wayland and Linuxfb? Also, have you modified anything in the filesystem? 

Regards,
Krunal

Hello,

           I tried the AM335x start kit platform, and used ti-processor-sdk-linux-am335x-evm-06.00.00.07 without modifying the SDK.

Because We need Chinese to be displayed, so  I only put it in /usr/share/fonts/ttf/FZLTHNokiaSans.ttf in the filesystem

The same problem occurs in eglfs.

When I used Wayland/Linuxfb to test, because of the desktop test error message, I could not use the original tst_inputpanel to test.

But we also found something, if I set

export QML_DISABLE_DISTANCEFIELD=1
or
export QT_QUICK_BACKEND=software
It seems to solve the current problem. However, the display of fonts is not good.

I think it has something to do with display acceleration.

Regards,
Oliver

Hi Oliver,

The basic example is supposed to look like the following: https://doc.qt.io/qt-5/qtvirtualkeyboard-basic-example.html. I am not sure what Qt out of box example you are running.

Regards,
Krunal

Hi,

I also faced similar type of issue on different board and build so might be you can try with by putting the fonts to /usr/lib/fonts directory and check the behavior  

Thanks and Regards 
Pravin Yadav