Created attachment 126366 [details] Example of Kontact Calendar in two hidpi screens configuration SUMMARY In my configuration, a fresh installation on Fedora 31, Kontact works well while in a single hidpi (3200x1800, scale factor 2) monitor setup. If I attach a second 4k monitor and I try to use Kontact UI in this second screen (moving it from the first screen or running it directly in that screen), widgets are not anymore in place: kontact become unusable, if you move mouse arount its window you can see how actual position of the cursor (the one you see) can trigger buttons and other items in a "different virtual position". Despite the cursor layout is absolutely not sorted. I attach a screenshot Sometimes KMail shows not bad but for sure the WebView to preview mail content is black and doesn't refresh/show. STEPS TO REPRODUCE 1. Configure a second 4k screen (not mirroring) 2. Run kontact 3. Move its window to the second screen or run kontact directly in the second screen SOFTWARE/OS VERSIONS Windows: No macOS: No Linux/KDE Plasma: Fedora 31 (Linux-5.4.17-200.fc31.x86_64) - Intel VGA (available in About System) KDE Plasma Version: 5.17.5 KDE Frameworks Version: 5.66.0 Qt Version: 5.13.2
PS. If you move kontact back to the primary monitor it will show up good.
I have the same issue. However, it is only from time to time that moving Kontact back to my laptop LCD screen restores the window so it becomes usable. Most of the time the Kontact window is all garbled. Resizing also doesn't redraw the window correctly, it's all over the place really. Below you find the machine info: Operating System: openSUSE Tumbleweed 20200226 KDE Plasma Version: 5.18.1 KDE Frameworks Version: 5.67.0 Qt Version: 5.14.1 Kernel Version: 5.5.5-1-default OS Type: 64-bit Processors: 12 × Intel® Xeon® E-2276M CPU @ 2.80GHz Memory: 125,5 GiB of RAM Nvidia driver version: 440.59
I think my problem is the same with 1 HiDpi and 1 non-HiDpi Screen attached. See https://bugs.kde.org/show_bug.cgi?id=414924
Created attachment 126658 [details] What my Kontact window looks like This is what my Kontact window looks like when a second display is attached.
This bug is not present on Ubuntu Eoan and, precisely, on the following setup SOFTWARE/OS VERSIONS Linux/KDE Plasma: KUbuntu Eoan (Linux-5.3.0-40-generic.x86_64) - Intel VGA KDE Plasma Version: 5.16.5 KDE Frameworks Version: 5.62.0 Qt Version: 5.12.4
The problem seems broader than kmail/kontact I feel. The other day when I opened an upload dialog from Firefox to select a file it looked ok until I moved the cursor. Same sort of garbled window and no possibility to work. It is becoming quite cumbersome to have to unplug my display to be able to read mail. Is there a way to know if this has actually been picked up already?
I would guess KMail is also one of the applications suffering from this Qt bug: https://techbase.kde.org/Development/Tutorials/Graphics/HiDPI#Dual-screen_setup