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  1. Qt
  2. QTBUG-76555

QNX on i.MX8QM - Unthrottled GPU for benchmarking

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Details

    • Bug
    • Resolution: Fixed
    • P2: Important
    • None
    • 5.12.4
    • GUI: OpenGL
    • None
    • QNX

    Description

      I’ve been using the following pattern in order to unthrottle the GPU for raw performance measurements:

       

       

      QSurfaceFormat format = QSurfaceFormat::defaultFormat();

format.setSwapInterval(0);

QSurfaceFormat::setDefaultFormat(format);

       

       

      However, it is not working with QNX 7.0.4 on the i.MX8QM. It seems that this is due to the code at:

      https://code.woboq.org/qt5/qtbase/src/plugins/platforms/qnx/qqnxwindow.cpp.html#760

      which hard codes SCREEN_PROPERTY_SWAP_INTERVAL to 1. It would be nice to have this addressed for benchmarking.

       

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          relates to

          User Story - Created by Jira Software - do not edit or delete. Issue type for a user story. QT3DS-2981 Support customer project B

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
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              jmcdonnell James McDonnell
              patrickshelly Patrick Shelly
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