both mouse and keyboard dont work together with linuxfb plugin

When launching apps on an embedded device like Xilinx Zc702 board with ARM cores, either keyboard or mouse working fine but not together. This is with linuxfb plugin.

Am using below steps to run my app:
export QT_QPA_PLATFORM=linuxfb
export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/local/lib/plugins
export QT_QPA_GENERIC_PLUGINS=evdevmouse
export QT_QPA_ENABLE_TERMINAL_KEYBOARD=1
echo "Starting Zynq Base TRD Application..."
./my_app

If I have to use keyboard, I change QT_QPA_GENERIC_PLUGINS variable value to evdevkeyboard and re-run my app.

Please let us know how to execute my app with both keyboard and mouse plugins. Please note that for some reason I cant use "-plugin keyboard -plugin mouse" command line option with my app (This app is not taking any command line options hence I am using above environment variables).