https://bugs.kde.org/show_bug.cgi?id=495788
Bug ID: 495788
Summary: Corrupted screenshare on multi-GPU system
Classification: Plasma
Product: xdg-desktop-portal-kde
Version: 6.2.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: shib...@protonmail.com
CC: aleix...@kde.org
Target Milestone: ---
Created attachment 175513
--> https://bugs.kde.org/attachment.cgi?id=175513&action=edit
Example of OBS running on integrated GPU (using DRI_PRIME=1!) and attempting to
screenshare
SUMMARY
I have a system with two GPUs, the one built-in to the 7800x3d and my dedicated
GPU is a Radeon RX580. When running applications on a different GPU, I can not
use the screensharing portal from that application as it results in corrrupted
output. Applications running on the other GPU display properly but if from
inside that application I attempt to screenshare I get something like what I've
attached.
I have reproduced it both ways. In my usual setup I have all display outputs
connected to the dedicated GPU, and if I open OBS/Firefox/Chrome (or any other
application with screensharing functionality) I get corrupted output. If I
switch all my outputs to my iGPU, restart KDE and then run OBS on my dedicated
GPU, then I get corrupted output.
For what it is worth, this does not seem to be a kde-only issue either, the
same happens in Hyprland using their portal. If I were to guess it is because
my dedicated GPU does not support modifiers at all (only LINEAR it seems), and
otherwise uses INVALID/internal modifiers. But I have a feeling this might
still be a portal bug since I don't think portals should give buffers with
internal modifiers but maybe a linear copy instead. I have attached
wayland-info output for this as well.
STEPS TO REPRODUCE
1. Use a multi-gpu setup, open an application using an alternate GPU and
attempt to screenshare
2. Select any window/display/etc in the screen share portal
OBSERVED RESULT
Corrupted output
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.11.6-cb3.0.lto.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7800X3D 8-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor: AMD Radeon Graphics
ADDITIONAL INFORMATION
Here is some output from OBS that might be useful
info: [pipewire] Created stream 0x5f42746152e0
info: [pipewire] Stream 0x5f42746152e0 state: "connecting" (error: none)
info: [pipewire] Playing stream 0x5f42746152e0
info: [pipewire] Stream 0x5f42746152e0 state: "paused" (error: none)
info: [pipewire] Negotiated format:
info: [pipewire] Format: 12 (Spa:Enum:VideoFormat:BGRA)
info: [pipewire] Modifier: 0x0
info: [pipewire] Size: 1920x1080
info: [pipewire] Framerate: 0/1
info: [pipewire] Negotiated format:
info: [pipewire] Format: 12 (Spa:Enum:VideoFormat:BGRA)
info: [pipewire] Modifier: 0xffffffffffffff
info: [pipewire] Size: 1920x1080
info: [pipewire] Framerate: 0/1
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