Description of problem: The screen starts to repaint multiple times a second if display configuration is changed in KDE Plasma 5, causing excessive GPU load, slowdowns, and higher temperature than expected. This is due to qt5-qtdeclarative bug, which is fixed in commit http://code.qt.io/cgit/qt/qtdeclarative.git/commit/?id=6990ae6c1bad32952e371fa72bee65a7af11c313 Version-Release number of selected component (if applicable): qt5-qtdeclarative-5.9.2-2.fc27.x86_64 How reproducible: 100% of the time Steps to Reproduce: 1. Boot KDE without external display connected. 2. Activate "Show Paint" kwin effect to see screen repaints. Notice that the screen does not get repainted if there are no updates on the screen. 3. Connect external display, configure it to be the only active display using KDE display configurator. 4. The screen start to flash because of excessive repaints. 5. Disconnect external display cable and switch to laptop display. The screen still flashes because of repaints. Actual results: GPU and CPU load is as usual Expected results: GPU and CPU load is higher than expected Additional info: See https://bugs.kde.org/show_bug.cgi?id=388759
I'll backport the fix (so we don't have to wait for 5.9.4)
It clearly applies to current Fedora 27 Qt5 5.9.2 version.
%changelog * Fri Jan 19 2018 Rex Dieter <rdieter> - 5.9.2-3 - branch backport: Stopped animators are not removed (#1536606,kde#388759) f26/f27 builds underway
qt5-qtdeclarative-5.9.2-3.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-8d1dd6043e
qt5-qtdeclarative-5.9.2-3.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-61e0dcaf5e
qt5-qtdeclarative-5.9.2-3.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-61e0dcaf5e
qt5-qtdeclarative-5.9.2-3.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-8d1dd6043e
qt5-qtdeclarative-5.9.2-3.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.
qt5-qtdeclarative-5.9.2-3.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.