https://bugs.kde.org/show_bug.cgi?id=494780
Bug ID: 494780
Summary: Performance Degradation on Nvidia (Hibrid) HDMI
Output with Triple Buffering Disabled (Fedora 40, KDE
Plasma)
Classification: Plasma
Product: kwin
Version: 6.2.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 174824
--> https://bugs.kde.org/attachment.cgi?id=174824&action=edit
Example of moving a screen creating jerky movement and high usage on Nvidia GPU
Summary: There is noticeable performance degradation when using an external
monitor connected via the Nvidia HDMI output on hibrid configuration AMD +
Nvidia laptops . The GPU usage spikes to 100% when moving windows on the
external monitor and moving windows around. This issue did not occur before
upgrading to KDE Plasma 6.2.
Steps to Reproduce:
Connect an external monitor to the Nvidia HDMI output.
Move windows around on the external monitor.
Observe GPU usage and performance when moving windows.
Expected Results: Smooth performance without excessive GPU usage.
Actual Results:
GPU usage reaches 100% (as observed via Btop++) when moving windows, causing
sluggish performance and jerky movement.
The issue is specific to the Nvidia HDMI output. When using the AMD integrated
graphics to connect the monitor, performance is smooth and the GPU use remains
minimum.
This performance degradation did not occur prior to KDE Plasma 6.2.
System Info:
Operating System: Fedora Linux 40
KDE Plasma Version: 6.2.0
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.2
Kernel Version: 6.11.3-350.vanilla.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840HS w/ Radeon 780M Graphics
Memory: 30.6 GiB of RAM
Graphics Processor: AMD Radeon 780M + Nvidia HDMI Output
Laptop Model: Victus by HP Gaming Laptop
Could be related to the issue #494407 as affects the same system configuration.
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