Created attachment 152725 [details] Visual example of sluggish resizing SUMMARY While working on an EGL example for Smithay's client toolkit, I noticed that resizing is not smooth. Interestingly this sluggish resizing does not occur in Sway. This dismisses improper protocol use as the most likely cause. Forcing use of zink (MESA_LOADER_DRIVER_OVERRIDE=zink) causes the sluggish resize to go away (likely because Zink is using Vulkan WSI under the hood). I suspect this may involve KWin's Wayland implementation or how the client behaves because running the glutin example (available here https://github.com/rust-windowing/glutin) uses winit and has smooth resize. STEPS TO REPRODUCE 1. Be running Plasma under Wayland 2. Run the EGL example here: https://github.com/i509VCB/client-toolkit/tree/egl-example (cargo run --example=egl --features="wayland-backend/client_system") 3. Try resizing the window 4. Window resizes sluggishly. OBSERVED RESULT Resizing is sluggish. EXPECTED RESULT Resizing should be smooth. SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.25.5 KDE Frameworks Version: 5.98.0 Qt Version: 5.15.6 ADDITIONAL INFORMATION Issue is reproducible on both of my machines (AMD and Intel graphics) Multiple attachments don't seem to be allowed, here is the first 300 ish lines of WAYLAND_DEBUG that includes the protocol logs while resizing the window https://gist.github.com/i509VCB/061ec56d9bf0ae9656b41df3af35937a
Thank you for the bug report! Please note that Plasma 5.25.5 is not supported for much longer by KDE; supported versions are 5.24, and 5.26 or newer. If at all possible please upgrade to a supported version and verify that the bug is still happening there.
(In reply to Bug Janitor Service from comment #1) > Thank you for the bug report! > > Please note that Plasma 5.25.5 is not supported for much longer by KDE; > supported versions are 5.24, and 5.26 or newer. > > If at all possible please upgrade to a supported version and verify that the > bug is still happening there. The bug still occurs on 5.26
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/3077
Sorry, wrong bug number. I have too many tabs open Can you test with Weston and/or Mutter as well? Comparing them + the relevant WAYLAND_DEBUG outputs may be helpful
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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!