QWidget::repaint() not working on ARM on program exit

[ericg22]

Hello Qt-perts,

I'd appreciate any suggestions on how to set a QStackedWidget view upon program exit on ARM? The code shown below works on x86 but not on ARM (using Qt 5.6 & linuxfb). No errors are generated but the repaint of the view widget does not have any effect and the last active view persists upon program exit. Any fixes and/or workarounds are appreciated.

TIA,

Eric Gilbertson
Peloton Technology

// Invoked in response to SIGINT.
void DriverGui::AppShutdown() {
// View persists after exiting so set this on the way out (works on x86 but not on ARM)
ui_->view_stack->setCurrentIndex((int)TruckInfo::ViewEnum::VIEW_CONNECTING);
ui_->view_stack->repaint();
ui_->connecting_view->repaint();
//ui_->view_stack->setVisible(false);
//ui_->view_stack->repaint();
//ui_->view_stack->setVisible(true);
//ui_->view_stack->repaint();
//qApp->processEvents();

QThread::msleep(5000);
exit(0);
}

[SGaist]

Hi,

Do you mean you would like to clear the content of your LinuxFB frame buffer on application exit ?

[ericg22]

@SGaist Preferably I would like to put up a view that contains a logo image but failing that setting itl black would suffice. I didn't mention it in the post but I am looking for something that will also work with eglfs which I suspect rules out sending 0's to the frame buffer. What I really don't get is why using Widget::repaint() works in x86 and yet appears to be a nop in ARM

[SGaist]

What should happen to your device when your application exits ?