Touchpad doesn't work

[Chris Kim]

I just reinstalled kubuntu and while using my laptop my touchpad stopped working. I restarted my computer and now the touchpad doesn't show up at all and doesn't work. I followed the instructions here https://wiki.ubuntu.com/DebuggingTouchpadDetection#In_case_your_Touchpad_doesn.27t_work_at_all_.28No_response_from_the_Touchpad.29 and the instructions say to file a bug since I don't see a synaptics touchpad entry in /proc/bus/input/devices. As instructed, I will also attach that file.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-42-generic 5.4.0-42.46
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: chris 977 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat Jul 25 10:33:04 2020
InstallationDate: Installed on 2020-07-25 (0 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 20KH002RUS
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=UUID=a844f512-56a4-4f99-a77e-b86a753812f7 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-42-generic N/A
 linux-backports-modules-5.4.0-42-generic N/A
 linux-firmware 1.187.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/16/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET68W (1.43 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KH002RUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0K17763 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN23ET68W(1.43):bd10/16/2019:svnLENOVO:pn20KH002RUS:pvrThinkPadX1Carbon:rvnLENOVO:rn20KH002RUS:rvrSDK0K17763WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon
dmi.product.name: 20KH002RUS
dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon
dmi.product.version: ThinkPad X1 Carbon
dmi.sys.vendor: LENOVO

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

This change was made by a bot.

[You-Sheng Yang (vicamo)]

P: /devices/platform/i8042/serio1
L: 0
E: DEVPATH=/devices/platform/i8042/serio1
E: SUBSYSTEM=serio
E: SERIO_TYPE=01
E: SERIO_PROTO=00
E: SERIO_ID=00
E: SERIO_EXTRA=00
E: MODALIAS=serio:ty01pr00id00ex00
E: SERIO_FIRMWARE_ID=PNP: LEN0091 PNP0f13

This should have been enabled in bug 1856583 with addition of LEN0091 id, but somehow it doesn't get probed on your system. Could you try to boot with following boot parameters that turns on driver debug prints:

  "dyndbg=file drivers/input/* +pt" i8042.debug=1

For detailed steps, please see https://wiki.ubuntu.com/Kernel/KernelBootParameters#Temporarily_Add_a_Kernel_Boot_Parameter_for_Testing .

[Chris Kim (chriskim06)]

Sure I'll try to do that in the next few days. Once I boot with those params should I reattach /proc/bus/input/devices?

Also my touchpad started working all of a sudden. I turned my laptop on and the touchpad was just working for some reason. I see the touchpad entry in /proc/bus/input/devices as well now.