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  1. Qt
  2. QTBUG-103822

QSerialPort::waitForReadyRead always returns false on older Windows systems

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Details

    • Windows
    • 01e0371f9d (qt/tqtc-qtserialport/5.15) f3a306a30f (qt/qtserialport/dev) f3a306a30f (qt/tqtc-qtserialport/dev) b71e60fbed (qt/tqtc-qtserialport/6.2) 6d5b4b3d71 (qt/qtserialport/6.3) 0f5d0b4bb2 (qt/qtserialport/6.4) 6d5b4b3d71 (qt/tqtc-qtserialport/6.3)

    Description

      When using QSerialPort::waitForReadyRead in an application that is running on older systems (3rd gen intel), Windows 10, the method always times out and returns false indicating the timeout / an error.

      If instead using readyRead signal and availableBytes, the data can be properly read.

      This does not reproduce on intel 4th gen or newer machines.

      Some examples of affected systems: 

      System Model	HP Compaq 8000 Elite SFF PC
System Type	x64-based PC
Processor	Intel(R) Core(TM)2 Duo CPU     E8500  @ 3.16GHz, 3166 Mhz, 2 Core(s), 2 Logical Processor(s)

      System Model   OptiPlex 7010
System Type      x64-based PC
Processor            Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, 3401 Mhz, 4 Core(s), 8 Logical Processor(s)

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          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-87151 QSerialPort: synchronous read fails as waitForReadyRead() always times out.

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-101444 QSerialPort: trouble with high baud rates / waitForReadyRead() stalls

          • 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.
          • Closed
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              ivan.solovev Ivan Solovev
              jussi_witick Jussi Witick
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              Dates

                Created:
                Updated:
                Resolved:

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