Touchpad recognised as generic mouse

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I have realised that if I restart the mouse twice in a row, the touchpad is recognised as such and starts working for a period of time.

```sudo modprobe -r psmouse```

```sudo modprobe psmouse```

Then, it is recognised back as a generic mouse and stops working.

Can you please attach acpidump?

With what options? How I do that?

Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8-rc4/

What's the touchpad vendor for this system? Elan or Synaptics?

Diffiult to say, as it is both in the name:

85ln02af.exe

Touchpad Driver (Elan, Synaptics, ALPS)
Synaptics_19.3.10.38_ELAN_11.4.92.1_ALPS_8.201.1611.252
Last Modified Date: 03 Nov 2017
Original Publish Date: 26 Jan 2016
Document ID: DS105106
Manufacturer:
    Elan, Synaptics, ALPS

https://pcsupport.lenovo.com/gb/en/products/laptops-and-netbooks/ideapad-y-series-laptops/y700-15isk/80nv/80nv00dxsp/pf0hck45/downloads/DS105106

Regarding the mainline kernel, that's way over my skills... how do I do that?

Thanks

```
 Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ETPS/2 Elantech Touchpad id=14 [slave pointer (2)]
```

UPDATE:
`uname -r
5.4.0-40-generic
`

Touchpad is still getting disconnected randomly and identified as generic mouse, and I have to use several times:

```sudo modprobe -r psmouse && sudo modprobe psmouse```

until is recognised again.

If you point me towards an info page I will try the mainline kernel.

Thanks for trying fixing this Khai-Hen Feng.

https://wiki.ubuntu.com/Kernel/MainlineBuilds

Thanks for that.

I have a nVidia GeForce GTX 960M graphic card.

I am using proprietary drivers; I didn't need to do anything, it was automatically installed when I first installed Ubuntu 20.04.

I've read on the page you sent me before, that I need to remove the nVidia drivers before installing the new kernel.

Is that really necessary? They really insist on that point.

If so, how do I remove them and installing them back? I am looking for answers in 'Ask Ubuntu', but as I didn't download the drivers and it was automatic, I don't know how to do it.

Sorry, I'm a noob and I'm really scared of messing up with the system as, although I have dual boot with Windows, I already have migrated plenty of stuff and I don't want to have to re-install everything back...

No, uninstalling drivers are unnecessary.

Only thing needs to do is to install the kernel debs.

Just tried it this afternoon.

The issue is not fixed; I'm not seeing any difference...

I'm still using the new kernel (5.8.0-050800-generic); Should I delete it?

Any other test?

kernel-bug-exists-upstream

Ok. Can you please boot Windows and take a screenshot like [1]?

[1] https://answers.microsoft.com/en-us/windows/forum/all/i2c-hid-driver/abb89c4f-f013-46da-b03a-624fcd657953?page=2

Can you please also find out which .inf it uses?

Ok, this mean it uses PS/2 mouse.

Can you please boot to mainline kernel with kernel parameter "dyndbg='file drivers/input/mouse/* +p'", and attach dmesg here?

It is using oem2.inf

I add the line at boot, by editing the grub and adding it at the end of the line which starts with 'linux', and I don't want to get to excited, but so far, so good...

So, with my usual kernel version, 5.4.0.40-generic, adding that line (exactly as it was written, including spaces, " and ' ) during boot ('e' -editing the grub), the touchpad works, but after the laptop goes idle or the screen is locked, it goes back as a generic mouse.

The trick of disconnecting and connecting it back with ```modprobe psmouse``` keeps working though...

I am trying it now with the latest version of the kernel 5.8.0-050800-generic.

The touchpad works from start. I have locked the screen and it keeps working after logging in.

Even better, all the multi-finger movements work as well ( I had fusuma, but 4 finger vertical swipe never worked; now, it is working).

I can't say yet that it has been fixed, but definitely we're on the right track!

Please let me know if I can do anything else to help you debug this thing.

Thanks!

I suspended my laptop during the night; when I logged in again, the touchpad worked for a while, but eventually got back as a generic mouse (still mainline kernel).

Hmm can you please attach dmesg on the failed case?

There are two methods for touchpad in ASL code that seems to be related to power control:

            Method (TPRD, 0, Serialized)
            {
                P80H = 0x2E
                Return (^^EC0.ECTP) /* \_SB_.PCI0.LPCB.EC0_.ECTP */
            }

            Method (TPWR, 1, Serialized)
            {
                P80H = 0x2F
                ^^EC0.ECTP = Arg0
            }

However, we'll need to ask Lenovo how and when to use them.

Is there anything else I can do?
I know Lenovo has an ubuntu forum, but hey are not very responsive...

I had to delete the mainstream kernel as I was having a horrible screen tearing (my graphic card was not supported).

I left the kernel parameter "dyndbg='file drivers/input/mouse/* +p'" and, although the issue still exists, it reduces the frequency of times I need to use the "modprobe" workaround.

Any news?

```ùname -r```
5.4.0-48-generic

Issue still ongoing

Hi,

```uname -r```
5.4.0-53-generic

Issue still ongoing

Hi,

```uname -r```
5.4.0-58-generic

Issue still ongoing.

Now, with the workaround

```sudo modprobe -r psmouse && sudo modprobe psmouse´´´

It still works, after typing several times the same command, but I noticed some things:

1.- Mouse gets idle sometimes and changes to generic mouse after that
2.- When working, settings are not working properly; Natural scrolling is on, but is not working, same than 'tap to click'.

Just switching off and on again the settings make it works properly, but this needs to be done every single time the 'modprobe' workaround finally works...

Hope this helps.

Hi,

```uname -r```

5.13.0-40-generic

Issue still ongoing.