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BlessedLongsword

Member

Registered: 2024-04-30

Posts: 43

[SOLVED] KDE Plasma 6.2, slowinness and tearing

Hello!

After upgrading to KDE Plasma 6.2 (using Wayland), I started experiencing extreme screen tearing and lagginnes when moving windows diagonally. My setup is the following:

A laptop connected to a dock to 2 external monitors. My laptop uses an integrated intel GPU and a dedicated NVIDIA GPU, although I only have active the nvidia GPU when connected to the external monitors, as I have this setup on boot using optimus manager. This issue only happens in the external monitors, I believe that even though only the nvidia GPU is active, the integrated GPU is still doing something in the laptop screen, as everything always has been miles smoother there, even before the update.

[antonio@Antonio ~]$ glxinfo -B
name of display: :1
display: :1  screen: 0
direct rendering: Yes
Memory info (GL_NVX_gpu_memory_info):
    Dedicated video memory: 6144 MB
    Total available memory: 6144 MB
    Currently available dedicated video memory: 5842 MB
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2
OpenGL core profile version string: 4.6.0 NVIDIA 560.35.03
OpenGL core profile shading language version string: 4.60 NVIDIA
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.6.0 NVIDIA 560.35.03
OpenGL shading language version string: 4.60 NVIDIA
OpenGL context flags: (none)
OpenGL profile mask: (none)

OpenGL ES profile version string: OpenGL ES 3.2 NVIDIA 560.35.03
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

I have the nvidia and nvidia-drm kernel modules set up with the following parameters:

nvida:

[antonio@Antonio ~]$ cat /proc/driver/nvidia/params 
ResmanDebugLevel: 4294967295
RmLogonRC: 1
ModifyDeviceFiles: 1
DeviceFileUID: 0
DeviceFileGID: 0
DeviceFileMode: 438
InitializeSystemMemoryAllocations: 1
UsePageAttributeTable: 1
EnableMSI: 1
EnablePCIeGen3: 0
MemoryPoolSize: 0
KMallocHeapMaxSize: 0
VMallocHeapMaxSize: 0
IgnoreMMIOCheck: 0
TCEBypassMode: 0
EnableStreamMemOPs: 0
EnableUserNUMAManagement: 1
NvLinkDisable: 0
RmProfilingAdminOnly: 1
PreserveVideoMemoryAllocations: 1
EnableS0ixPowerManagement: 0
S0ixPowerManagementVideoMemoryThreshold: 256
DynamicPowerManagement: 3
DynamicPowerManagementVideoMemoryThreshold: 200
RegisterPCIDriver: 1
EnablePCIERelaxedOrderingMode: 0
EnableResizableBar: 0
EnableGpuFirmware: 0
EnableGpuFirmwareLogs: 2
EnableDbgBreakpoint: 0
OpenRmEnableUnsupportedGpus: 1
DmaRemapPeerMmio: 1
ImexChannelCount: 2048
CreateImexChannel0: 0
RegistryDwords: ""
RegistryDwordsPerDevice: ""
RmMsg: ""
GpuBlacklist: ""
TemporaryFilePath: "/var/tmp"
ExcludedGpus: ""

nvidia-drm

Module: nvidia_drm
Parameter: fbdev --> Y
Parameter: modeset --> Y

Any suggestions or clues on what the cause is is appreaciated. I mainly want to know if it is a problem with my setup or a problem with the KDE update that will be fixed overtime. Thanks in advance!

Last edited by BlessedLongsword (2024-10-16 21:49:57)

Zibi1981

Member

From: Poland

Registered: 2008-01-31

Posts: 707

Re: [SOLVED] KDE Plasma 6.2, slowinness and tearing

I have a very similar issue on my laptop with Intel's iGPU and nVidia dGPU. Lagging can be especially seen while moving cursor. I also use Wayland, but I think the issue started with KDE Plasma 6.1, not 6.2.

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"... being a Linux user is sort of like living in a house inhabited by a large family of carpenters and architects. Every morning when you wake up, the house is a little different. Maybe there is a new turret, or some walls have moved. Or perhaps someone has temporarily removed the floor under your bed."

MSI Raider GE78HX 13VI-032PL

xapienz

Member

Registered: 2024-10-14

Posts: 1

Re: [SOLVED] KDE Plasma 6.2, slowinness and tearing

I had really bad artifacts on external monitor after upgrading to 6.2, and disabling triple buffering seems to have helped. It is still less smooth than 6.1, but no artifacts.

My workaround is to add this to `/etc/environment`:

KWIN_DRM_DISABLE_TRIPLE_BUFFERING=1

jronald

Member

Registered: 2022-05-09

Posts: 105

Re: [SOLVED] KDE Plasma 6.2, slowinness and tearing

I had really bad artifacts on external monitor after upgrading to 6.2, and disabling triple buffering seems to have helped. It is still less smooth than 6.1, but no artifacts.

My workaround is to add this to `/etc/environment`:

KWIN_DRM_DISABLE_TRIPLE_BUFFERING=1

I'm not sure if there are side-effects, so I'm waiting for official fix.

Zibi1981

Member

From: Poland

Registered: 2008-01-31

Posts: 707

Re: [SOLVED] KDE Plasma 6.2, slowinness and tearing

Something have been fixed in the recently released 6.2.1, but I'm still experiencing some mouse cursor lagging.

---

"... being a Linux user is sort of like living in a house inhabited by a large family of carpenters and architects. Every morning when you wake up, the house is a little different. Maybe there is a new turret, or some walls have moved. Or perhaps someone has temporarily removed the floor under your bed."

MSI Raider GE78HX 13VI-032PL

BlessedLongsword

Member

Registered: 2024-04-30

Posts: 43

Re: [SOLVED] KDE Plasma 6.2, slowinness and tearing

Latest update should have fixed everything, kwin 6.2.1.1-1

Zibi1981

Member

From: Poland

Registered: 2008-01-31

Posts: 707

Re: [SOLVED] KDE Plasma 6.2, slowinness and tearing

It hasn't, although it's better.

---

"... being a Linux user is sort of like living in a house inhabited by a large family of carpenters and architects. Every morning when you wake up, the house is a little different. Maybe there is a new turret, or some walls have moved. Or perhaps someone has temporarily removed the floor under your bed."

MSI Raider GE78HX 13VI-032PL