https://bugs.kde.org/show_bug.cgi?id=396551
Bug ID: 396551
Summary: Scrolling not smooth without MaxFPS=75 and
RefreshRate=75
Product: kwin
Version: 5.12.6
Platform: Kubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: minor
Priority: NOR
Component: platform-x11-standalone
Assignee: kwin-bugs-n...@kde.org
Reporter: scott.dea...@gmail.com
Target Milestone: ---
Created attachment 113958
--> https://bugs.kde.org/attachment.cgi?id=113958&action=edit
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.
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