https://bugs.kde.org/show_bug.cgi?id=477137
Bug ID: 477137
Summary: Top screen doesn't display graphics although the
cursor travels to it when in MUX mode on a dual-screen
laptop.
Classification: Plasma
Product: kwin
Version: master
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: grave
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: skokkin...@proton.me
Target Milestone: ---
SUMMARY
Plasma 6 from `kde-unstable` Arch repositories cannot display graphics on the
second screen on a dual-screen laptop when dGPU with MUX is enabled.
I have an Asus Zephryus Duo 2023 (7945HX with a MUX switched 4090 and two
screens) and , considering this might be a Wayland issue, I have tried using
Hyprland and Plasma on it. Both DEs can detect the second (primary - meaning
the top screen) screen but Hyprland doesn't really even enable it.
In Plasma 6, both with Nouveau (and NVK) and Nvidia drivers, Plasma fails to
display graphics on the top screen. The cursor travels to the top screen but no
graphics are displayed (the screen remains black). When trying to manually
enable the screen from the Plasma Setting app a single frame is displayed
offsetted and nothing else.
When the laptop doesn't use MUX switch (Optimus mode) everything works
properly. Currently ubmitting this bug from this laptop with Plasma 6 Wayland
on Optimus mode.
Specs:
CPU: AMD Ryzen 9 7945HX
GPU: Nvidia 4090 with MUX switch
RAM: 32 GBs DDR5
SSD: M.2 2TB
STEPS TO REPRODUCE
1. Set the laptop to MUX dGPU mode.
2. Log in to Plasma using SDDM
OBSERVED RESULT
The top screen doesn't display graphics although the cursor travels to it when
in MUX mode.
EXPECTED RESULT
The top screen should display graphics even when in MUX mode.
SOFTWARE/OS VERSIONS
Windows: -
macOS: -
Linux/KDE Plasma: Garuda Linux with KDE Plasma
KDE Plasma Version: 6 Alpha
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0
ADDITIONAL INFORMATION
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