Bug 427926

Summary:	Disable Animations when detecting software renderer
Product:	[Plasma] kwin	Reporter:	Rainer Finke <rainer>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	nate
Priority:	NOR
Version First Reported In:	5.20.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:	https://invent.kde.org/plasma/kwin/-/commit/96635ea29c6fd4e84690503f1ec28868d10963ee	Version Fixed/Implemented In:
Sentry Crash Report:

Description Rainer Finke 2020-10-18 13:51:43 UTC

When using Plasma Wayland with a software renderer (llvmpipe) e.g. in a virtual machine (VM) then the desktop is quite slow and sluggish. From my point of view animations should be turned off when detecting software rendering.

STEPS TO REPRODUCE
1. Run Plasma Wayland with llvmpipe (e.g. in a VM)

OBSERVED RESULT
-Slow and sluggish desktop

EXPECTED RESULT
- Acceptable speed of the desktop environment

Operating System: Arch Linux
KDE Plasma Version: 5.20.0
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1
Kernel Version: 5.9.1-arch1-1

Comment 1 Vlad Zahorodnii 2020-10-20 10:49:54 UTC

Do you have Mesa 20.2 on your computer?

Comment 2 Rainer Finke 2020-11-02 19:55:54 UTC

Yes, Mesa 20.2 is installed already. I think the main reason why it was so slow is related to the default QXL driver. Once I change this to Virtio in Virt-Manager it is much better. But the question really is if all these animations make sense if the hardware is not available to run it fast enough so that there is no stuttering/lag.