Touchpad not working on Lenovo ThinkPad L480 after upgrade to 19.04

[Beaud'huy Josselin]

Hello,

I upgrade ubuntu on 19.10 but my touchpad is not found. Can you help me ?

Thank you

Josselin

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: linux-image-5.0.0-13-generic 5.0.0-13.14
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jbeaud-huy 2159 F.... pulseaudio
 /dev/snd/controlC1: jbeaud-huy 2159 F.... pulseaudio
 /dev/snd/pcmC1D0p: jbeaud-huy 2159 F...m pulseaudio
CurrentDesktop: KDE
Date: Tue Apr 23 15:49:51 2019
InstallationDate: Installed on 2018-11-19 (154 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: LENOVO 20LTS6YR00
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-13-generic root=UUID=c816b2e0-898d-4948-80e7-1466ae6b59e3 ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-5.0.0-13-generic N/A
 linux-backports-modules-5.0.0-13-generic N/A
 linux-firmware 1.178
SourcePackage: linux
UpgradeStatus: Upgraded to disco on 2019-04-23 (0 days ago)
dmi.bios.date: 08/14/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: R0QET47W (1.24 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20LTS6YR00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrR0QET47W(1.24):bd08/14/2018:svnLENOVO:pn20LTS6YR00:pvrThinkPadL480:rvnLENOVO:rn20LTS6YR00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad L480
dmi.product.name: 20LTS6YR00
dmi.product.sku: LENOVO_MT_20LT_BU_Think_FM_ThinkPad L480
dmi.product.version: ThinkPad L480
dmi.sys.vendor: LENOVO

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

This change was made by a bot.

[Hui Wang (hui.wang)]

Please use a workaround first:

edit /etc/modprobe.d/blacklist.conf
add "blacklist i2c_i801" in the blacklist.conf
sudo update-initramfs -u

reboot

[Beaud'huy Josselin (jbeaud-huy)]

Well done, my touchpad is now working.

Thank you.

[Kai-Heng Feng (kaihengfeng)]

Can you remove i2c_i801 from backlist and test if this kernel helps?

https://people.canonical.com/~khfeng/lp1825996/

[Hui Wang (hui.wang)]

According to the error of dmesg, this bug should be a duplicate of #1825699 (about ThinkPad L580), if we can't fix it to make it have reliable i2c transfer, we might add this touchpad to i2c_blacklist_pnp_ids. But it is weird that we have a ThinkPad L480 in the Beijing office, which doens't have any touchpad issues after installing the ubuntu 19.04.

Need more investigation. I changed the bug title in order to let other L480 users report the bug if they also have touchpad issues after installing 19.04.

[Kai-Heng Feng (kaihengfeng)]

Hui,

Does the one you have use id "LEN2036"?

[Beaud'huy Josselin (jbeaud-huy)]

I tried to install https://people.canonical.com/~khfeng/lp1825996/ but it doesn't seem to work

[Hui Wang (hui.wang)]

OK, I will try to check it tomorrow or sometime later. Not late than Next Monday.

[Kai-Heng Feng (kaihengfeng)]

Beaud'huy,

Doesn't work in what regard? It can't boot?

[Beaud'huy Josselin (jbeaud-huy)]

It can boot but if I remove i2c_i801 from backlist touch pad does not work

[Hui Wang (hui.wang)]

Reply #7, I checked it on my machine, it is LEN2035.

[Hui Wang (hui.wang)]

To check the firmware_id, please run:
cd /sys/
sudo find . -iname firmware_id | xargs cat

[Kai-Heng Feng (kaihengfeng)]

It's LEN2036 on this system.

Beaud'huy, can you attach full dmesg under the test kernel?

[markus (markus-n3)]

affected:
find . -iname firmware_id | xargs cat
> PNP: LEN0071 PNP0303
> PNP: LEN2036 PNP0f13