https://forums.lenovo.com/t5/Other-Linux-Discussions/Lenovo-Yoga-S740 -Linux-Trackpad-very-temperamental-and-FN-Keys-barely-work/m-p/5037384
Just found out that this issue might be fixed in kernel 5.9. How could I install 5.9 kernel and test this? I have secure boot enabled so the mainline kernels are not working. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1872333 Title: MSFT0001:01 touchpad randomly does not work after boot (Lenovo Yoga S740) Status in linux package in Ubuntu: Confirmed Bug description: About 50% of the Ubuntu 20.04 Ubuntu boots end up so that the touchpad of my Lenovo Yoga S740 does not work (cursor does not move). External mouse works even then. After one or two reboots the touchpad starts working, and it works until the next boot, when it may not work again. This seems very similar to this Lenovo Yoga S940 touchpad problem: https://bbs.archlinux.org/viewtopic.php?id=252711 Attached (i2c_error.txt) is the output of "dmesg |grep i2c" on a boot when the touchpad did not work. The main error message seems to be "i2c_designware i2c_designware.1: controller timed out". The name of the touchpad is "MSFT0001:01 06CB:CDB0 Touchpad" (from cat /proc/bus/input/devices) This bug report has been created on a boot where the touchpad does work. FYI, on Windows, the touchpad has always worked without problems. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-21-generic 5.4.0-21.25 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu26 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: elias 1447 F.... pulseaudio /dev/snd/controlC0: elias 1447 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sun Apr 12 19:56:05 2020 InstallationDate: Installed on 2019-11-19 (144 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: LENOVO 81RS ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=UUID=101c7da4-860d-4496-ae06-d98699795f9a ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-21-generic N/A linux-backports-modules-5.4.0-21-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-04-04 (8 days ago) dmi.bios.date: 03/10/2020 dmi.bios.vendor: LENOVO dmi.bios.version: BYCN33WW dmi.board.asset.tag: NO Asset Tag dmi.board.name: LNVNB161216 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Yoga S740-14IIL dmi.modalias: dmi:bvnLENOVO:bvrBYCN33WW:bd03/10/2020:svnLENOVO:pn81RS:pvrLenovoYogaS740-14IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoYogaS740-14IIL: dmi.product.family: Yoga S740-14IIL dmi.product.name: 81RS dmi.product.sku: LENOVO_MT_81RS_BU_idea_FM_Yoga S740-14IIL dmi.product.version: Lenovo Yoga S740-14IIL dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872333/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
