Cursor response to touchpad sporadically becomes laggy

[Gabriele Romano]

when using for a bit the pc, under load but sporadically, the system slows down and appears to be some inertia to the pointer movement and the page scroll gestures, making impossible to perform precise point and click actions. With an external mouse does not happen, it happens only with the trackpad. My pc specs are quite high and i just changed thermal paste and in windows 10 it does not happen, so it's not an hardware issue.

No LSB modules are available.
Description: Ubuntu 24.04 LTS
Release: 24.04

xorg:
  Installed: 1:7.7+23ubuntu3
  Candidate: 1:7.7+23ubuntu3
  Version table:
 *** 1:7.7+23ubuntu3 500
        500 http://it.archive.ubuntu.com/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
Uname: Linux 6.8.0-31-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.capabilities.gpu0: Error: path was not a regular file.
.proc.driver.nvidia.capabilities.mig: Error: path was not a regular file.
.proc.driver.nvidia.gpus.0000.01.00.0: Error: path was not a regular file.
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 535.171.04 Tue Mar 19 20:30:00 UTC 2024
 GCC version:
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu May 30 23:56:34 2024
DistUpgraded: Fresh install
DistroCodename: noble
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation TigerLake-H GT1 [UHD Graphics] [8086:9a60] (rev 01) (prog-if 00 [VGA controller])
   Subsystem: Dell TigerLake-H GT1 [UHD Graphics] [1028:0a61]
   Subsystem: Dell GA107M [GeForce RTX 3050 Ti Mobile] [1028:0a61]
InstallationDate: Installed on 2024-05-15 (15 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
MachineType: Dell Inc. XPS 15 9510
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-31-generic root=UUID=8db8c7e9-ea5a-47ee-98c6-f88d66d3a956 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/08/2024
dmi.bios.release: 1.28
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.28.0
dmi.board.name: 0C6CP1
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.asset.tag: �,
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.28.0:bd03/08/2024:br1.28:svnDellInc.:pnXPS159510:pvr:rvnDellInc.:rn0C6CP1:rvrA01:cvnDellInc.:ct10:cvr:sku0A61:
dmi.product.family: XPS
dmi.product.name: XPS 15 9510
dmi.product.sku: 0A61
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.120-2build1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.0.5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1

[Daniel van Vugt (vanvugt)]

Scrolling inertia only exists in the apps themselves, so which app is of biggest concern here?

[Daniel van Vugt (vanvugt)]

Although if pointer movement is also affected then this is either a mutter or libinput bug. It shouldn't be assigned to Xorg when Wayland is in use.

[Daniel van Vugt (vanvugt)]

Does the problem happen after waking from sleep like bug 2063038?

[Gabriele Romano (gaggioaxel)]

No the problem happen independently if i put to sleep or not. After booting, and a bit of interaction with few programs open in the background, when i try to scroll, for example, a pdf using the trackpad then it start lagging and becoming not precise, but the behaviour is the same as described by the user in the bug you cited

[Daniel van Vugt (vanvugt)]

That user is me, and I haven't seen it recently so I don't recall if it's *only* when waking from sleep. But it is a real bug. I suspect we might merge these bugs in future...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

If the bug doesn't occur with an external mouse then it's less likely to be a cursor bug in Mutter and might be a touchpad bug in the kernel.

[Daniel van Vugt (vanvugt)]

I might have misinterpreted this bug and now wonder if it is similar to bug 2040977. Can you try the workaround mentioned there?

[Gabriele Romano (gaggioaxel)]

I've tried the workaround you suggested even if my problem is different, but the problem still occurr.
It does not happen using an external mouse, it's strictly linked with the trackpad.
I think it's a bug in the kernel too, because happens sporadically also when not under load, lasts for 10-20 seconds and disappear. This however happens recurrently.