SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. Connect an external display. 2. Set the FPS to 60 or 50. OBSERVED RESULT On the external display you will have at most half of the selected FPS. EXPECTED RESULT Get the selected fps and not half of them. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch Linux. Plasma 6 beta (available in About System) KDE Plasma Version: 5.90.0 KDE Frameworks Version: 5.246.0 Qt Version: 6.6.1 ADDITIONAL INFORMATION My computer uses two graphics cards, the nvidia graphics (GeForce GTX 1050 Mobile) and the intel integrated one. In KDE Plasma 5 this bug was fixed with the following flag in /etc/environment : KWIN_DRM_USE_MODIFIERS=0. I've been looking at other similar bugs where they tried using these others: KWIN_DRM_DISABLE_BUFFER_READABILITY_CHECKS=1. KWIN_DRM_PREFER_COLOR_DEPTH=24 KWIN_DRM_NO_AMS=1 All unsuccessful. I provide you with the qdbus information in case it is relevant: https://pastebin.com/raw/jM79m5yt Best regards, Jesus.
>On the external display you will have at most half of the selected FPS. How are you determining the FPS?
(In reply to David Edmundson from comment #1) > >On the external display you will have at most half of the selected FPS. > > How are you determining the FPS? Hi, Thank you for responding so quickly! I am measuring it from the website https://www.testufo.com/ . I have tried from both chrome and firefox. Both using Wayland (not xwayland). When the ufo test window is on the main screen, it shows 60 fps, but when I put it on the external monitor, it always drops to half of the settings. Best regards, Jesus.
*** This bug has been marked as a duplicate of bug 452219 ***