SUMMARY When on a mixed DPI setup (i.e. two 4k monitors at 195% and one 1440p ultrawide at 130%) and the xwayland "apply scaling themselves" option is set, some clients (including those not running on xwayland) render at an extremely high resolution (in this case, 5159x2184). If only one display is enabled, or all displays are using the same scaling factor, the problem goes away and windows are rendered at the native resolution of the monitor again. Some examples of non-xwayland apps being affected by this are: - Gamescope - Minecraft (using `glfw_wayland`) I've had this issue since I started using the Plasma wayland session, but I haven't gotten around to making a bug report until now. STEPS TO REPRODUCE 1. Have a mixed DPI setup 2. Set different DPI levels on two monitors 3. Open OBSERVED RESULT Games/apps rendering at an extremely high resolution EXPECTED RESULT Games/apps rendering at the native resolution of the monitor, as they do when all monitor have the same scaling factor SOFTWARE/OS VERSIONS Linux: 6.6.1 (available in About System) KDE Plasma Version: 5.27.80 KDE Frameworks Version: 5.245.0 Qt Version: 6.6.0 ADDITIONAL INFORMATION Marked severity as major as this effects gaming on all multi-dpi setups, as far as I can tell.
Could you attach a screenshot of the all screens that shows the issue? Possibly a variant of Bug 474738?
I'm not sure how I could show the issue, since it's a problem with the resolution of the windows (they otherwise work fine). Is there a debug app that displays the resolution it's rendering at or something?
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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!
I've done more testing and this doesn't seem to apply to wayland-native apps. Not sure if something got fixed, or if I was just testing it incorrectly before. Running minecraft with glfw-wayland will render at the native 3440x1440 resolution of my monitor while running it in xwayland will set the resolution to 5159x2184. This seems to hold true for every other game I've tested, so I'm currently running all my games in gamescope so they render at the correct resolution.
Someone else on Reddit seems to also be having this issue: https://reddit.com/r/linux_gaming/comments/1cp7hgu/plasma_multimonitor_gaming_woes/
*** This bug has been marked as a duplicate of bug 474738 ***