Bug 475872 - With an NVIDIA GPU on X11, resizing windows choppy when Pager widget is enabled
Summary: With an NVIDIA GPU on X11, resizing windows choppy when Pager widget is enabled
Status: CONFIRMED
Alias: None
Product: kwin
Classification: Plasma
Component: performance (show other bugs)
Version: 5.27.8
Platform: Manjaro Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-10-20 11:01 UTC by Klaus Zipfel
Modified: 2024-09-08 20:52 UTC (History)
6 users (show)

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Description Klaus Zipfel 2023-10-20 11:01:45 UTC 
Resizing a window becomes extremely choppy when the pager is added to the taskbar on systems using an nVidia GPU.

Only tested on X11 with proprietary nVidia driver (Version 535.113.01).


STEPS TO REPRODUCE
1. Have a dedicated nVidia GPU as primary GPU + proprietary nVidia driver
2. Add the pager to your taskbar
3. Open e.g. Dolphin and resize it. It feels choppy and delayed
4. Remove all pagers from the taskbar
5. Resizing e.g. Dolphin now is fluent.

OBSERVED RESULT
Choppy resizing

EXPECTED RESULT
Fluent resizing

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Manjaro Linux (latest)
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.11

ADDITIONAL INFORMATION
[1] Link to reddit discussion: https://www.reddit.com/r/kde/comments/yogjmu/extreme_lag_on_window_redrawresize
Comment 1 Nate Graham 2023-10-20 16:46:25 UTC 
Does it happen on Wayland as well?
Comment 2 Klaus Zipfel 2023-10-24 08:41:46 UTC 
I just tested it on Wayland, which seems to be unaffected by this bug.
Comment 3 ratijas 2024-05-03 14:40:17 UTC 
Quite interesting. I can confirm on X11 with proprietary NVIDIA driver on Arch.

Without the Pager, QtWidgets apps resizing is butter-smooth, and QtQuick ones still stagger but less. Panel floating/defloating animation is also affected: in a presence of a Pager the transition is like just first 1-2 frames and then half a second later suddenly just to the last frames; but without a Pager it is still somewhat of a slideshow but not *that* bad.
Comment 4 Yevhen Popok 2024-08-11 16:02:02 UTC 
I wonder if the option to disable window preview/outline (scheduled for Plasma 6.2) helps with this.
https://bugs.kde.org/show_bug.cgi?id=392484
Comment 5 ditto.ditto 2024-09-03 09:01:02 UTC 
I can confirm this bug  exits on X11 with nvidia open driver on openSUSE as well