20.04 LTS: Trackpad cursor on MacBook Pro freezes mid-motion

[Jon]

Reporting according to https://wiki.ubuntu.com/DebuggingTouchpadDetection , following section 4

Attaching:
xinput output
evtest output
xev output
xmodmap output

live videos of evtest and xev showing physical motion on trackpad without cursor movement: https://drive.google.com/drive/folders/1q44ZO7GdvVU2VLg6HatNPj19hD_SjtYk?usp=sharing

(videos may still be uploading / processing)

Model: MacBook Pro A1278 2010 model

Important: bug gets gradually worse until trackpad is no longer usable, restart helps

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-input-libinput 0.29.0-1
ProcVersionSignature: Ubuntu 5.15.0-46.49~20.04.1-generic 5.15.39
Uname: Linux 5.15.0-46-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Sep 10 09:03:24 2022
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
InstallationDate: Installed on 2022-07-23 (48 days ago)
InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223)
MachineType: Apple Inc. MacBookPro8,1
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-46-generic root=UUID=7a3fcdea-96d5-4ac7-942e-cf8967060e37 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-input-libinput
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/10/18
dmi.bios.release: 0.1
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP81.88Z.0050.B00.1804101331
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-94245B3640C91C81
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro8,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-94245B3640C91C81
dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0050.B00.1804101331:bd04/10/18:br0.1:svnAppleInc.:pnMacBookPro8,1:pvr1.0:rvnAppleInc.:rnMac-94245B3640C91C81:rvrMacBookPro8,1:cvnAppleInc.:ct10:cvrMac-94245B3640C91C81:skuSystemSKU#:
dmi.product.family: MacBook Pro
dmi.product.name: MacBookPro8,1
dmi.product.sku: System SKU#
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.107-8ubuntu1~20.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 21.2.6-0ubuntu0.1~20.04.2
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1