Description
So Direct Scanout is not working on KDE/Gnome when you use dGPU Nvidia to render the game, but works on igpu (radeon) but it works fine If i have Intel IGPU and Nvidia DGPU, only not working with AMD Configuration
More information is here
Regression
Works with Intel/Nvidia configuration but doesn’t work for Amd/Nvidia configuration
Step for reproduction
1- Run the game on Nvidia dgpu (prime-run) on the laptop with amd igpu
2- qdbus org.kde.KWin /KWin showDebugConsole Type this in console, maybe qdbus6 for newer system
3- Go to effects tab and enable showcompositing
4- Check if the Compositing on top right goes away or no, if no mean direct scanout not working
5- Work when the game is run on igpu
System information
╰─❮ inxi -GSC -xx
System:
Host: syntist-laptop Kernel: 6.19.3-2-cachyos arch: x86_64 bits: 64
compiler: clang v: 21.1.8
Desktop: KDE Plasma v: 6.6.0 tk: Qt v: N/A wm: kwin_wayland dm: SDDM
Distro: CachyOS base: Arch Linux
CPU:
Info: 6-core model: AMD Ryzen 5 6600H with Radeon Graphics bits: 64
type: MT MCP arch: Zen 3+ rev: 1 cache: L1: 384 KiB L2: 3 MiB L3: 16 MiB
Speed (MHz): avg: 3676 min/max: 413/4566 boost: enabled cores: 1: 3676
2: 3676 3: 3676 4: 3676 5: 3676 6: 3676 7: 3676 8: 3676 9: 3676 10: 3676
11: 3676 12: 3676 bogomips: 79050
Flags-basic: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a
ssse3 svm
Graphics:
Device-1: NVIDIA GA107M [GeForce RTX 3050 Mobile] vendor: Lenovo
driver: nvidia v: 590.48.01 arch: Ampere pcie: speed: 16 GT/s lanes: 8
ports: active: none empty: HDMI-A-1 bus-ID: 01:00.0 chip-ID: 10de:25a2
Device-2: Advanced Micro Devices [AMD/ATI] Rembrandt [Radeon 680M]
vendor: Lenovo driver: amdgpu v: kernel arch: RDNA-2 pcie: speed: 16 GT/s
lanes: 16 ports: active: DP-2,eDP-1 empty: DP-1, DP-3, DP-4, DP-5, DP-6,
DP-7, DP-8, Writeback-1 bus-ID: 06:00.0 chip-ID: 1002:1681 temp: 56.0 C
Device-3: Chicony Integrated Camera driver: uvcvideo type: USB rev: 2.0
speed: 480 Mb/s lanes: 1 bus-ID: 1-3:2 chip-ID: 04f2:b6c2
Display: wayland server: X.org v: 1.21.1.21 with: Xwayland v: 24.1.9
compositor: kwin_wayland driver: gpu: amdgpu d-rect: 4480x2520 display-ID: 0
Monitor-1: DP-2 pos: primary,top-left model: Acer EI322QUR res: 2560x1440
hz: 165 dpi: 93 diag: 806mm (31.7")
Monitor-2: eDP-1 pos: bottom-r model: Lenovo 0x9059 res: 1920x1080 hz: 120
dpi: 142 diag: 395mm (15.5")
API: EGL v: 1.5 platforms: device: 0 drv: nvidia device: 1 drv: radeonsi
device: 3 drv: swrast gbm: drv: kms_swrast surfaceless: drv: nvidia wayland:
drv: radeonsi x11: drv: radeonsi inactive: device-2
API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: amd mesa v: 26.1.0-devel
glx-v: 1.4 direct-render: yes renderer: AMD Radeon 660M (radeonsi rembrandt
ACO DRM 3.64 6.19.3-2-cachyos) device-ID: 1002:1681 display-ID: :0.0
API: Vulkan v: 1.4.341 surfaces: N/A device: 0 type: integrated-gpu
driver: mesa radv device-ID: 1002:1681 device: 1 type: discrete-gpu
driver: nvidia device-ID: 10de:25a2 device: 2 type: cpu
driver: mesa llvmpipe device-ID: 10005:0000
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor gpu: lact, nvidia-settings, nvidia-smi,
radeontop wl: wayland-info x11: xdpyinfo, xprop, xrandr
