When global scaling for the display is enabled, kmix doesn't show the mixer slider when left clicking on the system icon. I tried a fresh user profile. And kmix works as intended. Upon enabling global scaling (System Settings -> Display and Monitor -> Global scale). The issue occurs. In my case the global scale is a fractional number (125% or 1.25) STEPS TO REPRODUCE 1. Enable Glabal scaling 2. Left click on the system icon of kmix OBSERVED RESULT The mixer sliders doesn't show up. EXPECTED RESULT The mixer sliders should show up. SOFTWARE/OS VERSIONS KDE Frameworks 5.81.0 Qt 5.15.2 (built against 5.15.2) The xcb windowing system
Manually setting the scale factor, makes kmix behave as expected. QT_SCALE_FACTOR=0.8 kmix 1/1.25=0.8 This has nothing to do with fractional scaling. Running with an integer scale factor ha the same wrong behavior. QT_SCALE_FACTOR=1.6 kmix 1.25x1.6=2
OK. I think the problem is in file kmixdockwidget.cpp. // Now handle Multihead displays. And also make sure that the dialog is not // moved out-of-the screen on the right (see Bug 101742). const QScreen *screen = QGuiApplication::screenAt(pos); if (screen==nullptr) return; line 354 const QScreen *screen = QGuiApplication::screenAt(pos); should change to const QScreen *screen = QGuiApplication::screenAt(QCursor::pos()); With this change kmix seems to work OK with scale factors.