Created attachment 116567 [details] Window is snapped, can't be dragged on the second monitor SUMMARY To activate coolbits and fan control on Nvidia card, one has to create a X screen for each GPU in the PC. Usually only the first X-screen is "real", and all the physical monitors are connected to a single video card. Doing so, with multiple video card and multiple screens attached to the same video card, window snapping goes crazy: moving a windows from one screen to the other cause the window to be snapped in the first monitor instead of being moved to the next monitor. STEPS TO REPRODUCE 1. In a multi-GPU and multi-monitor environment, set Xserver like this: https://unix.stackexchange.com/questions/200553/multi-nvidia-gpu-overclocking-for-computations-cuda 2. Connect all the monitor to the first video card. 2. Settings > Desktop Behaviour > Screen Edges > Activate "Tile windows by dragging them to the left or right screen edges" 3. Drag a window and move to the next monitor. OBSERVED RESULT Window moved out of a main monitor will snap. EXPECTED RESULT Window moved out of a main monitor should not snap if the window is moved in the direction of another connected monitor. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Kubuntu 18.04 (with backports repo) KDE Plasma Version: 5.12.7 KDE Frameworks Version: 5.47.0 Qt Version: 5.9.5 ADDITIONAL INFORMATION It is also impossible to snap windows in the second monitor (both moving on top or on the border of the second monitor). Also there is another bug could be related: with the current Xserver configurations, Meta key will not start the application menù, while ALT+F1 will do the job correctly.
Please provide the output of qdbus org.kde.KWin /KWin supportInformation
Created attachment 116571 [details] supportInformation
I'm sorry, but multi-head setups are not really supported. This is the first time in years that a bug regarding multi head is reported. What you use in addition is multi screen on a multi head system. I wasn't even aware that this is possible. It's definitely not a feature we support. As X11 is feature frozen and this is a rather strong corner case setup I fear this will never get worked on.
In my field (computer vision and machine learning) it's not so unusual to have two or more GPU on a computer, and of course multiple screens. I have no problems with other desktop environments (I have tried gnome and cinnamon). Actually the root of the problem is Nvidia, because the only way to control the fan speed on linux on a graphic card is to have an X server running on that graphic card. With that configuration I was trying to start an x-server to the second graphic only with the end to control it's fan speed, while using the first graphic card for the output on the screen. The Destkop Envirnoment should just ignore the second x-server-screen, but kde plasma seems to have some problem and goes crazy.
Thank you for reporting this issue in KDE software. As it has been a while since this issue was reported, can we please ask you to see if you can reproduce the issue with a recent software version? If you can reproduce the issue, please change the status to "REPORTED" when replying. Thank you!
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!