When a window freezes, it becomes black and white and its title bar shows "not responding...". Under Wayland such situation remains even after the window to unfreeze. I need to minimize/unminimize the window to get rid of black and white coloration and "not reponding..." in the title bar. I already noticed such behavior on both Arch Linux (plasma 5.14 beta) and neon dev unstable. Discover and K3b are examples of affected apps.
How do you make Discover(or other) windows not responding?
gdb can freeze the process, but I can not reproduce the behavior reported here by freezing a window intentionally. I noticed that it's not necessary to minimize/unminimize the window to get rid of black and white coloration and "not reponding..." in the title bar. Click the window is enough.
Can't reproduce using kill -SIGSTOP
I can reproduce with K3b. I open K3b while a disc (audio cd) is into my optical deevice, K3b changes to "Not responding..." state. I need to click or minimize/restore its window to get rid of the "Not responding..." state. K3b 18.08.2 Operating System: Arch Linux KDE Plasma Version: 5.14.0 Qt Version: 5.11.2 KDE Frameworks Version: 5.51.0 Kernel Version: 4.18.12-arch1-1-ARCH
Can reproduce this bug with steps in https://bugs.kde.org/show_bug.cgi?id=401533
So, the problem is we send the ping event only in two cases: * when a client is closed; * when a client takes focus. If you'd like to unfreeze a window, just click somewhere in the window.
I can confirm this behaviour, especially with Kpatience who hangs very very often for some reason. Once it unfreezes, the window remains grey until I click somewhere in it.
I don't know if it is the same bug, but I noticed that on Plasma 5.15.90, when resuming the session, Kscreenlocker is always gray like it was not responding (although I can type my password to reopen my session).
(In reply to tromzy from comment #8) > I don't know if it is the same bug, but I noticed that on Plasma 5.15.90, > when resuming the session, Kscreenlocker is always gray like it was not > responding (although I can type my password to reopen my session). What if you disable the Desaturate Unresponsive Applications effect?
(In reply to Vlad Zagorodniy from comment #9) > (In reply to tromzy from comment #8) > > I don't know if it is the same bug, but I noticed that on Plasma 5.15.90, > > when resuming the session, Kscreenlocker is always gray like it was not > > responding (although I can type my password to reopen my session). > > What if you disable the Desaturate Unresponsive Applications effect? Sorry, I cannot test now because I switched back to Plasma 5.15.5.
I already noticed the same problem with the screen locker when running some versions of plama. But it never was consistently reproducible on my systems (Arch and neon).
*** Bug 411757 has been marked as a duplicate of this bug. ***
*** Bug 426294 has been marked as a duplicate of this bug. ***
*** Bug 427046 has been marked as a duplicate of this bug. ***
cannot reproduce on neon unstable.