When scrolling anywhere using 2 fingers the scroll bounces back if fingers are lifted up from touchpad. Soft finger point muscles have some flex to them and I strongly believe this causes the scroll bounce back. Easily repeated to both directions. In bounce scroll rapidly moves to the opposite direction of where user wanted to scroll when lifting up fingers.
Attached is log file evtest_event5.log from single scroll where there was bounce at lifting fingers.
Hardware details:
xinput --list
WARNING: running xinput against an Xwayland server. See the xinput man page for details.
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ xwayland-pointer:16 id=6 [slave pointer (2)]
⎜ ↳ xwayland-relative-pointer:16 id=7 [slave pointer (2)]
⎜ ↳ xwayland-pointer-gestures:16 id=8 [slave pointer (2)]
⎜ ↳ xwayland-touch:16 id=10 [slave pointer (2)]
⎜ ↳ xwayland-tablet stylus:16 id=11 [slave pointer (2)]
⎜ ↳ xwayland-tablet eraser:16 id=12 [slave pointer (2)]
⎜ ↳ xwayland-tablet cursor:16 id=13 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ xwayland-keyboard:16 id=9 [slave keyboard (3)]
lshw
*-input:0
product: Sleep Button
physical id: 2
logical name: input0
logical name: /dev/input/event0
capabilities: platform
*-input:1
product: Lid Switch
physical id: 3
logical name: input1
logical name: /dev/input/event1
capabilities: platform
*-input:2
product: Intel HID events
physical id: 4
logical name: input17
logical name: /dev/input/event9
capabilities: platform
*-input:3
product: ThinkPad Extra Buttons
physical id: 5
logical name: input18
logical name: /dev/input/event10
capabilities: platform
*-input:4
product: SYNA8007:00 06CB:CD8C Mouse
physical id: 6
logical name: input19
logical name: /dev/input/event4
logical name: /dev/input/mouse0
capabilities: i2c
*-input:5
product: Power Button
physical id: 7
logical name: input2
logical name: /dev/input/event2
capabilities: platform
*-input:6
product: SYNA8007:00 06CB:CD8C Touchpad
physical id: 8
logical name: input20
logical name: /dev/input/event5
logical name: /dev/input/mouse1
capabilities: i2c
*-input:7
product: Video Bus
physical id: 9
logical name: input22
logical name: /dev/input/event11
capabilities: platform
*-input:8
product: sof-hda-dsp Mic
physical id: a
logical name: input23
logical name: /dev/input/event12
*-input:9
product: sof-hda-dsp Headphone
physical id: b
logical name: input24
logical name: /dev/input/event13
*-input:10
product: sof-hda-dsp HDMI/DP,pcm=3
physical id: c
logical name: input25
logical name: /dev/input/event14
*-input:11
product: sof-hda-dsp HDMI/DP,pcm=4
physical id: d
logical name: input26
logical name: /dev/input/event15
*-input:12
product: sof-hda-dsp HDMI/DP,pcm=5
physical id: e
logical name: input27
logical name: /dev/input/event16
*-input:13
product: AT Translated Set 2 keyboard
physical id: f
logical name: input3
logical name: /dev/input/event3
logical name: input3::capslock
logical name: input3::numlock
logical name: input3::scrolllock
capabilities: i8042
*-input:14
product: TPPS/2 ALPS TrackPoint
physical id: 10
logical name: input5
logical name: /dev/input/event6
logical name: /dev/input/mouse2
capabilities: i8042
---
ProblemType: Bug
ApportVersion: 2.28.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/seq: think 2152 F.... pipewire
/dev/snd/controlC0: think 2152 F.... pipewire
think 2156 F.... wireplumber
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 24.04
InstallationDate: Installed on 2024-04-29 (1 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
MachineType: LENOVO 20UBCTO1WW
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-31-generic root=UUID=ef15c653-655e-4eb6-8f55-41ec14bbdb78 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
RelatedPackageVersions:
linux-restricted-modules-6.8.0-31-generic N/A
linux-backports-modules-6.8.0-31-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2
Tags: noble wayland-session
Uname: Linux 6.8.0-31-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sudo users
_MarkForUpload: True
dmi.bios.date: 11/06/2023
dmi.bios.release: 1.33
dmi.bios.vendor: LENOVO
dmi.bios.version: N2WET43W (1.33 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20UBCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.15
dmi.modalias: dmi:bvnLENOVO:bvrN2WET43W(1.33):bd11/06/2023:br1.33:efr1.15:svnLENOVO:pn20UBCTO1WW:pvrThinkPadX1YogaGen5:rvnLENOVO:rn20UBCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct31:cvrNone:skuLENOVO_MT_20UB_BU_Think_FM_ThinkPadX1YogaGen5:
dmi.product.family: ThinkPad X1 Yoga Gen 5
dmi.product.name: 20UBCTO1WW
dmi.product.sku: LENOVO_MT_20UB_BU_Think_FM_ThinkPad X1 Yoga Gen 5
dmi.product.version: ThinkPad X1 Yoga Gen 5
dmi.sys.vendor: LENOVO
I think this affects all laptop touchpads.
I have Lenovo Thinkpad X1 Yoga Gen 5 and Lenovo Thinkpad E15 Gen 2 which both have this undesired scroll effect.
Videos of what is happening:
1st video of finger movements and screen: https:/
2nd video of screen recording: https:/