Hi, I'm looking for advice on how to narrow down this delay issue, which is still present in 5.8.1. The delays make my desktop unusable when I set Primary display = external monitor.
Could this be an unfortunate issue in the interaction between kwin and XCB/X11 which occurs only if Primary display = external monitor, or can you think of another potential culprit? I would like to help debugging the issue -- if necessary, I can try to build Plasma from sources, but I will likely need some guidance. Thank you Fredy Neeser IBM Zurich Research Laboratory "Plasma-bugs" <plasma-bugs-boun...@kde.org> wrote on 06.10.2016 14:27:05: > From: "Fredy Neeser" <n...@zurich.ibm.com> > To: plasma-b...@kde.org > Date: 06.10.2016 14:27 > Subject: Plasma 5.7.5 / 5.8.0 multiscreen: Menu and widgets react to > mouse events with seconds of delay if Primary Display = external monitor > Sent by: "Plasma-bugs" <plasma-bugs-boun...@kde.org> > > Hello list > > After upgrading from Fedora 22 (Plasma 5.5.5) to Fedora 24 (Plasma > 5.7.5 and now 5.8.0), I experience a new, multiscreen - related > mouse-event handling problem, which was not present in Plasma 5.5.5. > B.t.w., I read about the multiscreen related improvements being > worked on in 5.7 and 5.8, which I do appreciate. > > I'm using a dual-screen setup (LVDS + external monitor), where I > usually set Primary Display = external monitor. Moreover, I place > the KDE Panel also on the external monitor. When I do that and try > to navigate through the Application Menu (launcher with cascading > popup menus) or when I click / move over a desktop widget, the > following happens: > > - After a mouse left click on the KDE menu icon (left hand side of > KDE Panel), the menu pops up only after a delay of >= 1 second > - When the mouse pointer is moved to another item in a popup menu, > the focus visibly jumps from item to item, and a delay of at least 1 > second is added on every intermediate item. > - When I click / move over a desktop widget, the desktop reacts with > a delay of >= 1 second > > Note that the delay occurs only for the panel and widgets on the > external monitor; if I add a second panel and move it manually to > the laptop screen, the menu on this second panel does NOT have a > delay problem. > > The delay problem on the menu consistently disappears when I set > Primary display = Laptop Screen, even when the KDE Panel is moved > manually (via Screen Edge) to the external monitor. > > B.t.w., after the recent design changes for multiscreen, it's > unclear to me in which case a Panel is supposed to move along with > the Primary display as opposed to being "pinned" to a specific > display. Could someone please clarify the behavior intended for > Plasma versions >= 5.7 ? Thanks! > > Also, the delay problem typically reappears when I go back to > Primary display = external monitor. Only in two out of perhaps a > dozen logout-login cycles, I observed that the delay problem was > gone, despite the fact that I had Primary display = external > monitor. This may indicate some kind of race condition at login. > > > Since this was an upgrade from an earlier Plasma version, I also > tried the following: > - Remove the contents of ~/.cache > - Temporarily remove ~/.config, ~/.local and ~/.kde and login to KDE > - Login to KDE as another user > but the delay problem behaved the same. > > > The delay problem is exactly the same for Plasma 5.7.5 and 5.8.0: > > Plasma 5.7.5 package versions: > kscreen-5.7.5-1.fc24.x86_64 > kwin-5.7.5-1.fc24.x86_64 > plasma-desktop-5.7.5-1.fc24.x86_64 > plasma-systemsettings-5.7.5-1.fc24.x86_64 > plasma-workspace-5.7.5-2.fc24.x86_64 > plasma-workspace-libs-5.7.5-2.fc24.x86_64 > qt5-qtbase-5.6.1-3.fc24.x86_64 > Plasma 5.8.0 package versions: > kscreen-5.8.0-0.1.fc24.x86_64 > kwin-5.8.0-0.1.fc24.x86_64 > plasma-workspace-5.8.0-0.1.fc24.x86_64 > plasma-workspace-libs-5.8.0-0.1.fc24.x86_64 > qt5-qtbase-5.6.1-3.fc24.x86_64 > > > Please advise on how to best narrow down this issue -- I'd be happy > to do some testing / debugging! > > I tried a KDE Neon Live Image yesterday, but the external monitor, > although shown by the kscreen control module, turns black after a > quick initial KDE logo splash at login. > > I wish some KDE debug messages could be seen in ~/.xsession-errors > (I enabled the debug messages using kdebugsettings), but I don't see > any of the familiar messages - maybe something is broken with the > KDE debug messages as well. This problem is now resolved -- debug messages appear in the system log. > Also, let me know if plasma-bugs is not the right list for this problem. > > Thank you!
