This is Bug 1967402 opened against Fedora 34, which is EOF so the bug was closed. Bug still exists in Fedora 37. Original report reads as follows: PyQt5 applications print out "QSocketNotifier: Can only be used with threads started with QThread" when executed. Version-Release number of selected component (if applicable): 5.15.0-8.fc34 How reproducible: Always happens on my system. Steps to Reproduce: Execute the following Python code. import sys from PyQt5.QtWidgets import QApplication, QLabel app = QApplication(sys.argv) label = QLabel('Hello World!') label.show() sys.exit(app.exec()) Actual results: The terminal shows "QSocketNotifier: Can only be used with threads started with QThread" when the program starts. Expected results: Nothing should be printed. I also see the problem using import matplotlib.pyplot as plt fig, ax = plt.subplots() This is part of a larger program that then does not show a graphic. Note that I am using Wayland.
I also have this bug on frdora 38 And i get this result in terminal: QSocketNotifier: Can only be used with threads started with QThread qt.qpa.qgnomeplatform.theme: The desktop style for QtQuick Controls 2 applications is not available on the system (qqc2-desktop-style). The application may look broken.
This message is a reminder that Fedora Linux 37 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 37 on 2023-12-05. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '37'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see it. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 37 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed.
Fedora Linux 37 entered end-of-life (EOL) status on None. Fedora Linux 37 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora Linux please feel free to reopen this bug against that version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see the version field. If you are unable to reopen this bug, please file a new report against an active release. Thank you for reporting this bug and we are sorry it could not be fixed.