https://bugs.kde.org/show_bug.cgi?id=461172
Bug ID: 461172
Summary: External screen runs with only 30fps under wayland
Classification: Plasma
Product: kwin
Version: 5.26.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: p...@ralfj.de
Target Milestone: ---
SUMMARY
I am trying wayland for the first time on my system, and overall it works
pretty well, despite my somewhat annoying multi-GPU setup involving an NVidia
GPU. However, things running on the external screen are only running at 30fps:
STEPS TO REPRODUCE
1. Run https://git.ralfj.de/gltest.git, or some other way or measuring FPS
2. Move the window between the internal screen of my laptop, and the external
screen
OBSERVED RESULT
On the internal screen it runs with 60fps. On the external screen it runs with
30fps.
EXPECTED RESULT
It should run with 60fps on all screens.
The lower framerate is even noticeable during normal desktop operation. When I
start a video game on the external screen, it likewise only achieves 30fps. So
I am fairly sure this is not caused by my little gltest program.
On my laptop, the internal screen is connected to the Intel GPU, but the HDMI
port with the external screen is connected to the NVidia GPU. I have the
proprietary Nvidia drivers installed. Remarkably, the external screen just
worked without any setup (nice!), but unfortunately there is this problem with
the framerate.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.26.0
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
Kernel Version: 6.0.0-2-amd64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Xeon® CPU E3-1505M v5 @ 2.80GHz
Memory: 31,2 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics P530
Manufacturer: LENOVO
Product Name: 20ENCTO1WW
System Version: ThinkPad P50
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