two-finger scrolling fails with AlpsPS/2 ALPS DualPoint Touchpad

[Pcarbonn]

After using the touchpad for a while, it suddenly believes that I'm doing a two-finger scroll, when I'm not. It makes the touchpad unusable : it's not possible to move the mouse anymore, vertical scrolling happens instead. I could not find an action that reliably gets me out of this mode (except reboot !).

My workaround for now is to disable two-finger scrolling in "Config / Devices / Mouse & Touchpad", and enable "Edge scrolling" instead.

I'm using Ubuntu 19.04 (Ubuntu 5.0.0-21.22-generic 5.0.15)

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: linux-image-5.0.0-21-generic 5.0.0-21.22
ProcVersionSignature: Ubuntu 5.0.0-21.22-generic 5.0.15
Uname: Linux 5.0.0-21-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: pcarbonn 1752 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 1 10:52:38 2019
InstallationDate: Installed on 2019-07-12 (19 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
MachineType: HP HP ZBook 15 G5
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-21-generic root=UUID=f1861701-080f-4cd2-a32f-da146eeb4c50 ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-5.0.0-21-generic N/A
 linux-backports-modules-5.0.0-21-generic N/A
 linux-firmware 1.178.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/03/2019
dmi.bios.vendor: HP
dmi.bios.version: Q70 Ver. 01.07.01
dmi.board.name: 842A
dmi.board.vendor: HP
dmi.board.version: KBC Version 15.37.02
dmi.chassis.asset.tag: 5CD926C8K6
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrQ70Ver.01.07.01:bd06/03/2019:svnHP:pnHPZBook15G5:pvr:rvnHP:rn842A:rvrKBCVersion15.37.02:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP ZBook 15
dmi.product.name: HP ZBook 15 G5
dmi.product.sku: 3AX13AV
dmi.sys.vendor: HP

[Pcarbonn (pierre-carbonnelle)]

Here is the output of xinput list:

⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech Optical USB Mouse id=11 [slave pointer (2)]
⎜ ↳ ALP001F:00 044E:1222 Mouse id=14 [slave pointer (2)]
⎜ ↳ ALP001F:00 044E:1222 Touchpad id=15 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint TouchPad id=18 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint Stick id=19 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
    ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
    ↳ Power Button id=6 [slave keyboard (3)]
    ↳ Video Bus id=7 [slave keyboard (3)]
    ↳ Video Bus id=8 [slave keyboard (3)]
    ↳ Power Button id=9 [slave keyboard (3)]
    ↳ Sleep Button id=10 [slave keyboard (3)]
    ↳ HP HD Camera: HP HD Camera id=12 [slave keyboard (3)]
    ↳ HP HD Camera: HP IR Camera id=13 [slave keyboard (3)]
    ↳ ALP001F:00 044E:1222 UNKNOWN id=16 [slave keyboard (3)]
    ↳ AT Translated Set 2 keyboard id=17 [slave keyboard (3)]
    ↳ HP Wireless hotkeys id=20 [slave keyboard (3)]
    ↳ HP WMI hotkeys id=21 [slave keyboard (3)]

(The problem also happens without attaching the Logitech Optical USB mouse)

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Pcarbonn (pierre-carbonnelle)]

I should add that, when the mousepad has this funny behavior, the trackpoint (i.e., pointing stick) still works correctly.

[Hui Wang (hui.wang)]

Why does your laptop has both i2c and ps/2 touchpad/trackpoint?

⎜ ↳ ALP001F:00 044E:1222 Mouse id=14 [slave pointer (2)]
⎜ ↳ ALP001F:00 044E:1222 Touchpad id=15 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint TouchPad id=18 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint Stick id=19 [slave pointer (2)]

So your touchpad and trackpoint are driven by ALP001F or AlpsPS/2?

[Kai-Heng Feng (kaihengfeng)]

Does this issue happen after S3?

[Pcarbonn (pierre-carbonnelle)]

I'm not sure what you are talking about ? i2c ? S3 ? Sorry.

I can understand that the problem may be due to having 2 drivers for the TouchPad. I'm not sure how they got there. The only driver I have updated is the NVIDIA one.
I have the same problem with the trial Ubuntu on USB. The PC is relatively new (a few weeks).

[Kai-Heng Feng (kaihengfeng)]

S3 means system suspend.

Can you also attach dmesg after the issue happens?

[Pcarbonn (pierre-carbonnelle)]

I did S3 by rotating the screen down towards the keyboard (--> screen goes black), then back up, and the bug appeared after a minute. Attached is dmesg.

[Kai-Heng Feng (kaihengfeng)]

If it _only_ happens after S3, then it can be this bug:
https://bugzilla.kernel.org/show_bug.cgi?id=203995