Bug 486900

Summary:	Low FPS/laggy rendering of floating panel adjustment when switching virtual desktops
Product:	[Plasma] plasmashell	Reporter:	Liz Lee <waynejwoww>
Component:	Panel	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	niccolo.venerandi
Priority:	NOR
Version First Reported In:	6.0.5
Target Milestone:	1.0
Platform:	Fedora RPMs
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=489396
Latest Commit:		Version Fixed/Implemented In:	6.1
Sentry Crash Report:

Description Liz Lee 2024-05-11 17:43:27 UTC

STEPS TO REPRODUCE
1. Have a floating panel.
2. Have a maximized window on virtual desktop #1.
2. Do not have a maximized windows on virtual desktop #2.
3. Switch between the virtual desktops.

OBSERVED RESULT
The animation of the adjustment of the floating panel (to either expand to the edges/borders or retract from them) is  rendered with very low FPS which looks laggy.

EXPECTED RESULT
A smooth animation.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40 Kernel 6.8.9-300.fc40.x86_64, wayland 
(available in About System)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0

GRAPHICS INFO
Compositing
===========
Compositing is active
Compositing Type: OpenGL
OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon R9 380 Series (radeonsi, tonga, LLVM 18.1.1, DRM 3.57, 6.8.9-300.fc40.x86_64)
OpenGL version string: 4.6 (Core Profile) Mesa 24.0.6
OpenGL platform interface: EGL
OpenGL shading language version string: 4.60
Driver: Unknown
GPU class: Unknown
OpenGL version: 4.6
GLSL version: 4.60
Mesa version: 24.0.6
X server version: 1.23.2
Linux kernel version: 6.8.9
Direct rendering: Requires strict binding: no
Virtual Machine:  no
OpenGL 2 Shaders are used

ADDITIONAL INFORMATION
It does not matter if the animation for switching desktops is set to "Slide", "Fade Desktop" or deactivated at all.

Comment 1 Liz Lee 2024-05-11 17:48:18 UTC

To prevent any misunderstandings: only the animiation of the panel is laggy. the desktop-switching animation itself is unaffected and works fine.

Comment 2 Liz Lee 2024-05-11 20:37:42 UTC

actually i just recognized that the laggy rendering occurs also when i move a window towards the floating panel. (i can't imagine why the floating panel is expanding to the edges/borders at all when i do not maximize a window, but that's not the problem here).

in this case the lagging only seems to occur when the panel is expanding (or at least it is not as obvious when it is retracting in this case).

the rendereing issues also occur not only on the beforementioned desktop pc with a radeon r9 380, but also on my laptop that runs an AMD Ryzen 6600HS with an APU (OS and Plasma versions are the same though).

Comment 3 Liz Lee 2024-05-26 06:46:19 UTC

update to Plasma 6.0.5, the problem still exists

KDE Plasma Version: 6.0.5
KDE Frameworks: 6.2.0
Qt Version: 6.7.0
Kernel: 6.8.10-300

Comment 4 Liz Lee 2024-06-20 11:47:36 UTC

Fixed since update to plasma 6.1