Common Issues

Qt Sensors: Sensor Support Depends on Hardware

The supported devices have no built-in sensor hardware.

Limited Support for Multiple Top-Level Windows

OpenGL and Qt Quick 2 applications can only have one full screen window existing at a time. Trying to create another OpenGL window, or trying to mix an OpenGL window with a raster one will display an error message and abort the application.

QML Debugging not Functional with Qt Quick Compiler

QML debugging is not fully functional when Qt Quick Compiler is enabled. Support for this is planned for a later release.

Error: Failed to establish an ADB connection to the device

From Qt 5.9.0 onwards, the failing ADB connection error messages described in QTBUG-60736 will be seen in the Qt Creator General Messages tab when using the emulator. The error note appears if your development host has both Boot to Qt 5.9.0 (or later) and Qt 5.8.0 (or older).

You can safely ignore the error messages if the emulator works correctly. The error messages do not appear if you uninstall Boot to Qt 5.8.0 (or older) from your development host.

I receive a SIGILL signal from OpenSSL when I debug my application

Even though your application works without errors in release mode, you may receive a SIGILL signal from OpenSSL when you debug your application.

This is a known issue in OpenSSL. For more information, see https://www.openssl.org/docs/faq.html#PROG15.

You can use the following work-arounds:

• In Qt Creator, select Tools > Options > Debugger > GDB and write set handle SIGILL nostop to Additional Startup Commands.
• Set the value of the environment variable OPENSSL_armcap to ARMV7_NEON Relevant.

Device-Specific Issues

BD-SL-i.MX6: Device Stops Working After Disconnecting the Micro-USB Cable

The device does not respond to touch input after connecting to a host computer via USB, and then disconnecting the Micro-USB cable.

Ixora Carrier Board Connected Over USB Is Not Always Detected

The Ixora carrier board connected over USB is not detected if a jumper JP2 is placed in. The jumper JP2 is located between the USB ports in the carrier board.

For more information about the jumper JP2 in the Ixora carrier board, see the chapter 3.5 in http://docs.toradex.com/104004-apalis-arm-ixora-datasheet-v1-1.pdf.