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 -- You are receiving this mail because: You are watching all bug changes.