[Lenovo Ideapad S145 82DJ0001BR] touchpad not working - does not appear on "cat /proc/bus/input/devices"

[Thiago Flaulhabe Xavier Gomes]

Laptop model: Lenovo Ideapad S145 82DJ0001BR
Manufacturer of the Touchpad: Elan, Synaptics
When the symptom first appeared: At the time I installed Ubuntu on my notebook (dual-boot) - it works fine on Windows.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-55-generic 5.8.0-55.62~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-55.62~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-55-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 11 11:58:39 2021
InstallationDate: Installed on 2021-06-09 (1 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: No upgrade log present (probably fresh install)

[Po-Hsu Lin (cypressyew)]

Hi,
Can you give the latest mainline kernel a try to see if this issue exists in the upstream?
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.13-rc7/

Please download and install amd64/build generic deb files (files marked A, see section "How do I install an upstream kernel?" in https://wiki.ubuntu.com/Kernel/MainlineBuilds) and reboot, let us know if it works and paste your "uname -a" command output in a terminal (ctrl+alt+t) here.
Thanks

[Hui Wang (hui.wang)]

Please test this kernel and upload the dmesg ($dmesg > dmesg.txt): https://people.canonical.com/~hwang4/lp1921649/

thx.

[Thiago Flaulhabe Xavier Gomes (flaulhabe)]

Hey, I've tested the kernel as suggested by Hui Wang (5.8.0-60-generic) and now my touchpad is working normally. Thanks!

I couldn't install the latest kernel as suggested by Po-Hsu Lin because I was getting errors with unmet dependecies in one of the .deb files, even after installing the other two.

As requested, I'm uploading the dmesg.

[Hui Wang (hui.wang)]

Thanks for testing, and the fixing patch is only in the test kernel currently.

[Hans de Goede (j-w-r-degoede)]

Sorry that it is taking so long to fix this. There have been several attempts at fixing this upstream already, but all of them had to be reverted/dropped because they were causing issues on other laptop models.

The latest attempt at fixing this is here:
https://<email address hidden>/

And this patch, or something close to it will hopefully go upstream soon.

Perhaps one of the Ubuntu kernel devs can provide a test kernel with this patch for Ubuntu users with this problem to test?

[Kai-Heng Feng (kaihengfeng)]

Test kernel can be found here:
https://people.canonical.com/~khfeng/lp1932069/

[Thiago Flaulhabe Xavier Gomes (flaulhabe)]

Hey, how can I try this test kernel (5.18.0-3)? I've downloaded the three files in the link above but I can't install any of them, I'm always receiving the "unmet dependencies" warning.

[Kai-Heng Feng (kaihengfeng)]

Do you use 22.04?

[Thiago Flaulhabe Xavier Gomes (flaulhabe)]

No, I'm using Ubuntu 20.04.4 LTS.

[Kai-Heng Feng (kaihengfeng)]

If "pci=nocrs" kernel parameter can workaround the issue, the fix from Hans should work. I'll backport it to both 20.04 and 22.04 kernel once it's in upstream.

[Thiago Flaulhabe Xavier Gomes (flaulhabe)]

So is there something I can do right now? I did not understand very well if there's already a updated fix I can try.

[Bjorn Helgaas (bjorn-helgaas)]

This is likely a duplicate of https://bugs.launchpad.net/bugs/1878279

The current upstream resolution to this problem is https://git.kernel.org/linus/d341838d776a ("x86/PCI: Disable E820 reserved region clipping via quirks"), which relies on quirks that match DMI Vendor, Product Version, Product Name, and Board Name. This isn't an ideal solution because there are likely other systems we don't know about that need a similar fix.

The patch I'm attaching here is an experimental idea to work around this issue without the maintenance burden of the quirks.

If anybody would be willing to test this patch, I would be very grateful. To test it, apply this patch to your kernel, boot with "pci=use_e820 efi=debug", and collect the dmesg log.