[Interest] Touch frozen in Qt 5.15.9

[Axel Spoerl]

Hi Poonam,

I have experienced (under more)

  *   crashes and freezes resulting from finger-drumming on a touch screen
  *   double clicks getting ignored
  *   touch events getting ignored after focus changes

QTBUG-86013 can't be applied to Qt 5.15.
"touch/UI freeze issues are being seen intermittently" / "not responding when a button is clicked" are very general descriptions.
That's why I can't say if it's relevant.

If you want to stabilize touch performance, I strongly recommend upgrading to Qt 6. If you still encounter touch bugs in Qt 6, they will be fixed. It's unlikely, that touch bugs can/will be fixed in 5.15.

Cheers
Axel
________________________________
Von: Poonam Sangale <sanglepoonam123 at gmail.com>
Gesendet: Mittwoch, 21. Februar 2024 11:46
An: Axel Spoerl <axel.spoerl at qt.io>
Cc: interest at qt-project.org <interest at qt-project.org>
Betreff: Re: [Interest] Touch frozen in Qt 5.15.9

Sie erhalten nicht oft eine E-Mail von sanglepoonam123 at gmail.com. Erfahren Sie, warum dies wichtig ist<https://aka.ms/LearnAboutSenderIdentification>
Hi Axel,


Our device is imx6 with protocol B multi touch screen and mtdev enabled in yocto configuration.
Can you please let me know if the patch mentioned in https://bugreports.qt.io/browse/QTBUG-86013 is relevant and can be applied to Qt 5.15
since it is incorporated only in Qt6?

Have you ever experienced touch not responding on an imx6 device with above configuration at times when a button is clicked in Qt Quick application ?

Appreciate your feedback in this regard.


Thank you,

Poonam

On Wed, Feb 21, 2024 at 2:53 PM Axel Spoerl via Interest <interest at qt-project.org<mailto:interest at qt-project.org>> wrote:
Hi Poonam,

The issue I mentioned is not fixed in 5.15. Touch improvements made in Qt 6 can’t be pinned to a single patch.

Sorry for not providing better news.

Cheers
Axel

On 19 Feb 2024, at 12:34, Poonam Sangale <sanglepoonam123 at gmail.com<mailto:sanglepoonam123 at gmail.com>> wrote:


Sie erhalten nicht oft eine E-Mail von sanglepoonam123 at gmail.com<mailto:sanglepoonam123 at gmail.com>. Erfahren Sie, warum dies wichtig ist<https://aka.ms/LearnAboutSenderIdentification>

Hi Axel,

Thank you for your response. Are touch-related issues fixed in the latest Qt 5.15.16?

Can you share the patch for 5.15.9 to fix touch related issues?

Regards, Poonam

On Mon, Feb 19, 2024 at 4:36 PM Axel Spoerl via Interest <interest at qt-project.org<mailto:interest at qt-project.org>> wrote:
Hi,

5.15.9 is quite outdated (current is 5.15.16).
A number of known touch-related issues have been fixed with https://codereview.qt-project.org/c/qt/qtbase/+/516578, included in 6.7.
Touch handling has been seen major improvements in Qt 6.
If the issue persists with a more recent Qt Version (I'd recommend 6.5), please file a bug report with a precise description and a minimal, compilable reproducer.

Regards,
Axel

________________________________
Von: Interest <interest-bounces at qt-project.org<mailto:interest-bounces at qt-project.org>> im Auftrag von Poonam Sangale <sanglepoonam123 at gmail.com<mailto:sanglepoonam123 at gmail.com>>
Gesendet: Montag, 19. Februar 2024 11:12
An: interest at qt-project.org<mailto:interest at qt-project.org> <interest at qt-project.org<mailto:interest at qt-project.org>>
Betreff: [Interest] Touch frozen in Qt 5.15.9

Hi,


We are using Qt 5.15.9 commercial license with Yocto Dunfell configuration using evdev touch plugin on IMX6 based device.
Here are the exported environment variables being used:
export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event0
export QT_QPA_PLATFORM = eglfs



However, touch/UI freeze issues are being seen intermittently.



Any recommendations on the environment variables if required to use export QT_QPA_EVDEV_TOUCHSCREEN_INPUT=/dev/input/event0 instead or any known issues in Qt 5.15.9?


Regards,

Poonam

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