happily using kscreen, i noticed a new problem with the lock screen when the laptop is locked and a new monitor is plugged in. kscreen turns off the laptop monitor, activates the external monitor, and i can suddenly see my dekstop / windows .. the session is still locked, however. this only happens with compositing active. without compositing, everything works as expected. i have confirmed that: * the view is being moved to the new monitor * the view is resized correctly if i remove the _KDE_SCREEN_LOCKER atom from the locker qml view window in UnlockApp::eventFilter in ksmserver/screenlocker/greeter/greeterapp.cpp then it flickers madly and can not be interacted with when the monitor change occurs. as this is a security issue, i've marked the bug severity as GRAVE. feel free to adjust to taste :) Reproducible: Always Steps to Reproduce: 1. with a laptop, teach kscreen to turn off the laptop screen and active an external screen on being plugged in (or equiv with a multi-screen desktop) 2. with the laptop not plugged into the external monitor, lock the desktop (qdbus org.kde..ksmserver /ScreenSaver Lock) 3. plug in the second monitor
I'm not convinced that this bug is in KWin - the fact that it is only showing with compositing doesn't say much. The Greeter is an Unmanaged window as we can see in ksmserver/screenlocker/greeter/greeterapp.cpp: view->setWindowFlags(Qt::X11BypassWindowManagerHint); So KWin is not responsible for correctly positioning it. This has to be done by ksmserver.
Afaiu the black lockscreen window is supposed to protect the content. I can confirm that it does NOT update it's size (noticed that after fixing the qml greeter adaption) and actually wanted to look into that (not gonna be /that/ simple since it freaks around in the X11 event processing, don't expect to receive some event from QDesktopWidget) I agree that this should not actually be an issue of compositing, the locker is not supposed to be ARGB, so you should neverever be able to look through.
https://git.reviewboard.kde.org/r/108585/
Git commit 7f48bf01b3092f9232b095be42995c7ef0de5c1e by Aaron Seigo. Committed on 30/01/2013 at 10:29. Pushed by aseigo into branch 'KDE/4.10'. the window needs to be *raised* it is not managed by the window manager (explicitly) so it needs to handle this itself. this completes the "fix the situation when new screens appear while locked" problem REVIEW:108643 M +1 -1 ksmserver/screenlocker/greeter/greeterapp.cpp http://commits.kde.org/kde-workspace/7f48bf01b3092f9232b095be42995c7ef0de5c1e