QGeoPositionInfoSource::NonSatellitePositioningMethods blocks app

[catharsis]

I have the following code (basically starting network positioning and receiving updates):

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QTimer>

#include <QtCore/QCoreApplication>

#define CELL_UPDATE_INTERVAL 10000

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow), cellSource(0)
{
    ui->setupUi(this);
    QTimer::singleShot(2000, this, SLOT(initCellPositioning()));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::showExpanded()
{
#if defined(Q_OS_SYMBIAN) || defined(Q_WS_SIMULATOR) || defined(Q_WS_MAEMO_5)
    showMaximized();
#else
    show();
#endif
}


void MainWindow::initCellPositioning()
{
    if(!cellSource)
        cellSource = QGeoPositionInfoSource::createDefaultSource(this);

    if(cellSource) {
        cellSource->setPreferredPositioningMethods(QGeoPositionInfoSource::NonSatellitePositioningMethods);
        cellSource->setUpdateInterval(CELL_UPDATE_INTERVAL);
        connect(cellSource, SIGNAL(positionUpdated(QGeoPositionInfo)),
                this, SLOT(cellPositionUpdate(QGeoPositionInfo)));
        connect(cellSource, SIGNAL(updateTimeout()), this, SLOT(cellUpdateTimeout()));
        cellSource->startUpdates();
    }
}


void MainWindow::cellPositionUpdate(QGeoPositionInfo info)
{
    QDateTime time = QDateTime::currentDateTime();
    ui->listWidget->insertItem(0, time.toString("hh:mm:ss.zzz"));
    if(info.isValid()) {
        qDebug()<<time.toString("hh:mm:ss.zzz")<<info;
    }
}

void MainWindow::cellUpdateTimeout()
{
    QDateTime time = QDateTime::currentDateTime();
    ui->listWidget->insertItem(0, "Timeout: " + time.toString("hh:mm:ss.zzz"));
    qDebug()<<"timeout"<<time.toString("hh:mm:ss.zzz");
}

On some devices (old C5, 6710s), instead of giving a positionUpdated signal every 10s, it blocks the application giving as many updates per second as possible. Here is a sample of debug log (I had to kill it quick):

Executable file: 10696 2012-05-16T11:42:39 C:\QtSDK\Symbian\SDKs\Symbian1Qt473\\epoc32\release\gcce\udeb\CellLocationTest.exe
Starting application...
Application running with pid 602.
[Qt Message] "11:42:49.811" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.104" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.129" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.156" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.184" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.213" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.243" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.277" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.309" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.342" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.377" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.413" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.464" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.512" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.559" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.606" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.655" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.702" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.750" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.798" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.810" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.858" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.906" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:50.955" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
[Qt Message] "11:42:51.004" QGeoPositionInfo(QDateTime("Wed May 16 08:42:49 2012") , QGeoCoordinate(62.6, 29.7462, 94), HorizontalAccuracy=168, VerticalAccuracy=230.457)
Finished.

Is there any way of using successfully Network Positioning on the phones I mentioned?

[teemup]

Have you tried checking the value of the interval with updateInterval() in the cellUpdateTimeout()?
Try writing that on the log.

If it doesn't work, you could try different interval values (such as 2000) and see if that helps.

If it is a bug, then it should be fixed. Of course it won't help you right now.
Have you tried simply throwing away the signals if they appear too often?
This should be the most future-sure fix for the issue.