D29569: Fix computing display geometry on multi-monitor HiDPI setups on X11
printesoi added a comment. @zzag yes, but as per the https://doc.qt.io/qt-5/qscreen.html#availableGeometry-prop, it does not work on setups with multiple displays :) REPOSITORY R278 KWindowSystem REVISION DETAIL https://phabricator.kde.org/D29569 To: printesoi, davidedmundson, #kwin, zzag Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
D29569: Fix computing display geometry on multi-monitor HiDPI setups on X11
printesoi added a comment. I would like to add some more details about my setup: I have a laptop with a 4K display and I use a second 4K external monitor. I have enabled the 200% scalling and `xrandr -q | grep -E '\bconnected' `gives DP-0 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 609mm x 349mm DP-2 connected primary 3840x2160+0+2160 (normal left inverted right x axis y axis) 344mm x 193mm ie: the external monitor is set at 0,0 (on top) and the laptop monitor is set at 0,2160 (on bottom) I created a minimal project that shows the problem in this setup https://github.com/printesoi/kwindowsystem-workarea-test and without the patch the results I get from the code above is (I have a 32px panel on the bottom of the primary (laptop) screen): QRect KWindowSystemPrivateX11::workArea(int desktop): QRect(0,0 1920x2128) QRect KWindowSystemPrivateX11::workArea(const QList , int desktop): QRect(0,0 960x1588) REPOSITORY R278 KWindowSystem REVISION DETAIL https://phabricator.kde.org/D29569 To: printesoi, davidedmundson, #kwin, zzag Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
D29569: Fix computing display geometry on multi-monitor HiDPI setups on X11
printesoi added reviewers: davidedmundson, KWin. REPOSITORY R278 KWindowSystem REVISION DETAIL https://phabricator.kde.org/D29569 To: printesoi, davidedmundson, #kwin Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
D29569: Fix computing display geometry on multi-monitor HiDPI setups on X11
printesoi created this revision. Herald added a project: Frameworks. Herald added a subscriber: kde-frameworks-devel. printesoi requested review of this revision. REVISION SUMMARY KWindowSystem::workArea() and KWindowSystem::workArea(QList()) should return the same value, but the second call returned an incorrect value on multi-monitor HiDPI setups. The cause is that the former uses NETRootInfo::workArea() whereas the second one uses displayGeometr() to compuse base work area. displayGeometry() on X11 platform did not take into account the device pixel ratio. REPOSITORY R278 KWindowSystem REVISION DETAIL https://phabricator.kde.org/D29569 AFFECTED FILES src/platforms/xcb/kwindowsystem.cpp To: printesoi Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
Tips for testing and debugging KWindowSystem
Hi all, Can someone give me tips on how to test KWindowSystem while developing? I have a dual 4K monitor setup and I have found a bug that seems to reside in KWindowSystem. I would like to try to fix it and then submit a patch, but I would like to know what's the best way to test and especially to debug this component. Especially, is it safe to install alongside system packages (I'm running Arch linux)? How can I debug it (gdb, qDebug())? Kind regards, Victor Dodon.
