Hello, I was recommended to post an issue here, rather than the qt forum.
*Original post*: https://forum.qt.io/topic/92664/display-issue-with-qt- application-windows-over-ssh-x11 *Pretty much copied below verbatim:* I'm attempting to use PyQt apps on a remote Linux server by SSH and X11 forwarding. The application window is all black and unusable. Only the window's title bar exists to close it. I believe it has to do with Qt and OpenGL over ssh/X11. Using Windows 10, PuTTY, VcXsrv, and the PyQt apps are on a Linux OpenSUSE 42.3 host (nVidia drivers). The apps work fine locally. More details follow: I can display glxgears over ssh/x11 - not optimal, but at least displays. *1. Display issues with Spyder 3.2.8 & 3.3.0 with Qt/PyQt (5.9.4/5.9.2)* - Full issue description: https://github.com/spyder-ide/ spyder/issues/7447 - Issue was closed since it is likely a Qt/PyQt problem. - Note: Spyder displays correctly over ssh/x11 when older versions of Qt/PyQt(5.6.2/5.6.0) are used The PuTTY terminal displays following: % spyder QQuickWidget: Failed to make context current QQuickWidget::resizeEvent() no OpenGL context QQuickWidget: Failed to make context current QQuickWidget: Failed to make context current QQuickWidget::resizeEvent() no OpenGL context QQuickWidget: Failed to make context current QQuickWidget: Attempted to render scene with no context QQuickWidget: Attempted to render scene with no context composeAndFlush: makeCurrent() failed *2. Display issues with PyQt5 opengl examples from*: https://github.com/baoboa/pyqt5 - Specifically 2dpainting.py from: https://github.com/baoboa/ pyqt5/tree/master/examples/opengl <https://github.com/baoboa/pyqt5/tree/master/examples/opengl> - *However* these examples even fail with qt/pyqt(5.6.2/5.6.0) over ssh/x11, not just (5.9.4/5.9.2) - The non-opengl examples seem to work ok. (not black filled) QOpenGLWidget: Failed to make context current QPainter::begin: Paint device returned engine == 0, type: 1 QPainter::setRenderHint: Painter must be active to set rendering hints QPainter::translate: Painter not active QPainter::save: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active ... QPainter::restore: Unbalanced save/restore QPainter::setPen: Painter not active QPainter::setFont: Painter not active QPainter::end: Painter not active, aborted composeAndFlush: makeCurrent() failed composeAndFlush: makeCurrent() failed QPainter::begin: Paint device returned engine == 0, type: 1 QPainter::setRenderHint: Painter must be active to set rendering hints *Any recommendations to try for #1 & #2?* - I tried pyqt 5.11.2 but with same results. - Qt/ OpenGL Environment variables/settings? - Could this be any way related to how Qt is compiled? I'm using versions from https://repo.anaconda.com/pkgs/main/linux-64/ or https://conda-forge.org/feedstocks/ <https://conda-forge.org/feedstocks/>. *3. qt5/pyqt5 performance degradation over ssh/x11* This maybe a separate topic all together, but I will likely notice performance degradation over ssh/x11 if it occurs. Based on previous posts I suspect it will. Any idea if these changes will be in later versions of qt/pyqt? (To help with ssh/X11 performance) - https://codereview.qt-project.org/#/c/181609/ - https://codereview.qt-project.org/#/c/151141/ See Bug/Posts: - https://bugreports.qt.io/browse/QTBUG-56851 - https://forum.qt.io/topic/56672/need-help-with- performance-of-qt-application-when-x11-forwarding <https://forum.qt.io/topic/56672/need-help-with-performance-of-qt-application-when-x11-forwarding> - https://stackoverflow.com/questions/28782162/serious- performance-problems-with-qt5-and-x11 <https://stackoverflow.com/questions/28782162/serious-performance-problems-with-qt5-and-x11> 4. Can anyone comments on these apps rather than the standard ssh w/x11 forwarding? ( ssh/x11 method has worked fine for years for several Qt applications -- looks like a qt regression to me ) - https://xpra.org/ - https://wiki.x2go.org/doku.php - https://virtualgl.org/ Thank you!
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