https://bugs.kde.org/show_bug.cgi?id=495287
Bug ID: 495287
Summary: PipeWire Screen Capture Freezes Fullscreen Target
Applications running on secondary GPUs
Classification: Plasma
Product: kwin
Version: 6.2.2
Platform: Arch Linux
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: dreamsyn...@gmail.com
Target Milestone: ---
SUMMARY
Performing a PipeWire screen capture that invokes Portal is freezing the
targeted Window if a Window is selected rather than the whole screen, but only
for devices with two GPUs where the secondary GPU is being used to render the
target Window. kwin 6.1.2 does not have the issue. All newer versions
experience this bug.
STEPS TO REPRODUCE
On a computer with two GPUs (such as a laptop) running Wayland (iGPU & dGPU)
with "obs-studio" installed...
1. Launch any fullscreen application where the secondary GPU will be used (ex
use prime-run). In my own tests, I use dolphin-emu, pick my dGPU in Graphics
configuration, use Vulkan as backend, launch a process, then Alt+Enter to full
screen the application.
2. Launch OBS Studio
3. Create a new source "Screen Capture (PipeWire)"
4. Open this source and select "Open Selector"
5. When Portal appears, select "Windows" and select your fullscreen
application.
6. Immediately the target application should freeze/halt - no frames will be
generated. Triggering focus/unfocus on the window with alt-tab will sometimes
unfreeze the application.
7. Close OBS / stop the PipeWire capture - the application will unfreeze.
OBSERVED RESULT
An OBS PipeWire 'Windows' capture freezes target applications if on Wayland
with dGPU on kwin 6.2.2
EXPECTED RESULT
An OBS PipeWire 'Windows' capture properly can view the window, and the target
application is not frozen. kwin 6.1.2 is the last version where this works as
expected.
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.6.57-2-cachyos-lts (64-bit)
Graphics Platform: Wayland
Processors: 32 × 13th Gen Intel® Core™ i9-13900HX
Memory: 31.1 GiB of RAM
Graphics Processor: Mesa Intel® Graphics (iGPU) & NVIDIA GeForce RTX 4080
(dGPU)
ADDITIONAL INFORMATION
I noticed another user reported the exact same issue on an unrelated forum. I
did not see this reported on KDE bugtracker, which led me to opening this.
https://forum.endeavouros.com/t/screen-freezing-in-fullscreen-apps-using-prime-run/61880
It is worth noting additionally similar weird behavior was observed on kwin
versions 6.1.3-6.2.0 on a Desktop with one GPU. Though the freezing occurred if
a target application would hide the mouse cursor. At one point the freezing was
flipped to only occur if the mouse was shown, and not freeze when hidden.
However I can not reproduce any such freezing for single GPU case as of 6.2.2.
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