| Summary: | Scrolling not smooth without MaxFPS=75 and RefreshRate=75 | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Scott Deagan <scott.deagan> |
| Component: | platform-x11-standalone | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED FIXED | ||
| Severity: | minor | CC: | kde.org |
| Priority: | NOR | ||
| Version First Reported In: | 5.12.6 | ||
| Target Milestone: | --- | ||
| Platform: | Kubuntu | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed/Implemented In: | ||
| Sentry Crash Report: | |||
| Attachments: |
xrandr -q output
Requested output of Support Information |
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Please provide output of qdbus org.kde.KWin /KWin supportInformation Created attachment 113959 [details]
Requested output of Support Information
Requested output of Support Information.
Please try setting compositing to default OpenGL 2. Reverting to OpenGL 2 makes not difference - scrolling still exhibits "micro-stutters". I have found that setting MaxFPS and RefreshRate to 65 also works well (i.e. results in very smooth scrolling). This issue report is quite old. Can you please confirm, that it still persists with KDE 5.23? (In reply to kde.org from comment #5) > This issue report is quite old. Can you please confirm, that it still > persists with KDE 5.23? This is no longer an issue with KDE 5.23. Will close this ticket. User reports issue is fixed |
Created attachment 113958 [details] xrandr -q output I have a Lenovo ThinkPad T470 running Kubuntu 18.04. With the default install, moving windows around and scrolling (in Firefox or an Android Virtual Device) was noticeably "jerky" ("micro-stutters" - not sure what else to call it). It was by no means unusable or terrible, but I noticed a significant difference in the "smoothness" compared to my Lenovo ThinkPad T450s. After spending a lot of time searching for a solution (and if there was indeed a problem) and trying out a load of different tweaks/configs/settings, I finally found a way to make things near "pixel-perfect" smooth: In ~/.config/kwinrc: RefreshRate=75 MaxFPS=75 This seems odd as my T470 panel is a 60Hz panel (I have attached the output of xrandr -q). I have tried various other settings, but nothing else results in "near pixel-perfect" smoothness for animations/scrolling. I understand this is very subjective (i.e. discussing scrolling "smoothness"), but I'm not sure how to quantify such an issue. As mentioned above, I don't have any such issues on my T450s.