Public bug reported:

The Fujitsu E5410 (model type 5E14A1 according to the bottom sticker) is
supplied with an Elantech(?) Touchpad. This apparently requires i2c_hid
and does not properly work in Ubuntu 20.04. It seems also to interfere
with the (internal) keyboard.

Problem behavior:

booting Ubuntu 20.04 with kernel 5.11.0-27:
keyboard works, touchpad is not recognized.
Running sudo modprobe i2c_hid manually from a terminal sometimes results in the 
touchpad working. Sometimes however the keyboard does not recognize any input 
anymore. After rebooting, approx 1/2 times the keyboard is not working anymore.

Making sudo modprobe i2c_hid permanent via /etc/modules-load.d/
permanently crashes the keyboard on startup such that it is impossible
to log in.

booting with kernel 5.14.0-1004-oem:
sudo modprobe i2c_hid has no effect, the touchpad is never recognized. Booting 
with this kernel, 9/10 times the keyboard is not recognized at all and one 
cannot log in. Permanently loading the module via /etc/modules-load.d has no 
effect.

booting with kernel 5.14.9-051409 (a mainline kernel from 
ppa:tuxinvader/lts-mainline ):
modprobing the i2c_hid module has no effect. The keyboard works.

probably not just xserver-xorg-input-libinput but also i2c_hid is
affected. However w.r.t.
https://wiki.ubuntu.com/DebuggingTouchpadDetection and without being
able to further diagnose the problem I filed this bug against xserver-
xorg-input-libinput.


(likely) relevant output of cat /proc/bus/input/devices:

I: Bus=0018 Vendor=04f3 Product=308a Version=0100
N: Name="0X45 0X4C 0X41 0X4E 04F3:308A Touchpad"
P: Phys=i2c-0X45 0X4C 0X41 0X4E 0X30 0X44 0X30 0X30 0X00:00
S: Sysfs=/devices/pci0000:00/0000:00:15.3/i2c_designware.1/i2c-2/i2c-0X45 0X4C 
0X41 0X4E 0X30 0X44 0X30 0X30 0X00:00/0018:04F3:308A.0002/input/input26
U: Uniq=
H: Handlers=mouse2 event14 
B: PROP=1
B: EV=1b
B: KEY=e520 30000 0 0 0 0
B: ABS=2e0800000000003
B: MSC=20


I: Bus=0018 Vendor=04f3 Product=308a Version=0100
N: Name="0X45 0X4C 0X41 0X4E 04F3:308A Mouse"
P: Phys=i2c-0X45 0X4C 0X41 0X4E 0X30 0X44 0X30 0X30 0X00:00
S: Sysfs=/devices/pci0000:00/0000:00:15.3/i2c_designware.1/i2c-2/i2c-0X45 0X4C 
0X41 0X4E 0X30 0X44 0X30 0X30 0X00:00/0018:04F3:308A.0002/input/input24
U: Uniq=
H: Handlers=mouse1 event13 
B: PROP=0
B: EV=17
B: KEY=30000 0 0 0 0
B: REL=3
B: MSC=10

I: Bus=0011 Vendor=0001 Product=0001 Version=ab54
N: Name="AT Translated Set 2 keyboard"
P: Phys=isa0060/serio0/input0
S: Sysfs=/devices/platform/i8042/serio0/input/input2
U: Uniq=
H: Handlers=sysrq kbd event2 leds 
B: PROP=0
B: EV=120013
B: KEY=402000000 3803078f800d001 feffffdfffefffff fffffffffffffffe
B: MSC=10
B: LED=7

I: Bus=0019 Vendor=0000 Product=0000 Version=0000
N: Name="Fujitsu FUJ02E3"
P: Phys=FUJ02E3/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/FUJ02E3:00/input/input7
U: Uniq=
H: Handlers=rfkill kbd event3 
B: PROP=0
B: EV=13
B: KEY=40000 0 0 0 0 181000000000c00 300000 0 0
B: MSC=10

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-input-libinput 0.29.0-1
ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-27-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 25 13:50:39 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
InstallationDate: Installed on 2021-10-04 (21 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 04f2:b6a0 Chicony Electronics Co., Ltd FJ Camera
 Bus 001 Device 004: ID 8087:0026 Intel Corp. 
 Bus 001 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: FUJITSU CLIENT COMPUTING LIMITED LIFEBOOK E5410
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no username)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-27-generic 
root=UUID=521e4756-042b-473e-adce-11bbb047275b ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-input-libinput
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/06/2021
dmi.bios.release: 2.20
dmi.bios.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.bios.version: Version 2.20
dmi.board.name: FJNB2D6
dmi.board.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.board.version: A2
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.chassis.version: LIFEBOOK E5410
dmi.modalias: 
dmi:bvnFUJITSUCLIENTCOMPUTINGLIMITED:bvrVersion2.20:bd07/06/2021:br2.20:svnFUJITSUCLIENTCOMPUTINGLIMITED:pnLIFEBOOKE5410:pvr10601736746:rvnFUJITSUCLIENTCOMPUTINGLIMITED:rnFJNB2D6:rvrA2:cvnFUJITSUCLIENTCOMPUTINGLIMITED:ct10:cvrLIFEBOOKE5410:
dmi.product.family: LIFEBOOK-FTS
dmi.product.name: LIFEBOOK E5410
dmi.product.sku: SK00
dmi.product.version: 10601736746
dmi.sys.vendor: FUJITSU CLIENT COMPUTING LIMITED
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.105-3~20.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.2
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2
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

** Affects: xserver-xorg-input-libinput (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal ubuntu

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https://bugs.launchpad.net/bugs/1948667

Title:
  Elantech Touchpad not working on Fujitsu E5410

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