I've been working with a Fedora reporter to try and solve the case where pci=nocrs helps to get a working touchpad, see: https://bugzilla.redhat.com/show_bug.cgi?id=1868899
Thanks to the latest set of logs attached there, I now am finally starting to understand what is going on here. Your BIOS claims that any memory between 0x000000004bc50000-0x00000000cfffffff is reserved: [ 0.000000] BIOS-e820: [mem 0x000000004bc50000-0x00000000cfffffff] reserved But then continuous with placing the iomem window for PCI devices inside that reserved range: [ 0.609988] pci_bus 0000:00: root bus resource [mem 0x65400000-0xbfffffff window] This confuses the kernel and makes it unable to assign PCI iomem to devices which have not already been assigned iomem by the BIOS, like the I2C-controller used for the touchpad. If you are interested in / curious about the low level details, I'm discussing this with the kernel PCI developers (including figuring out how to deal with this) here: https://lore.kernel.org/linux-pci/7d80f639-0768-850b-5313-3bdedf0a5...@redhat.com/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed-hwe in Ubuntu. https://bugs.launchpad.net/bugs/1878279 Title: MSFT0004:00 06CB:CD98 Touchpad/trackpad mouse randomly not recognized from any given boot Status in Linux: Confirmed Status in Ubuntu: Confirmed Status in linux-signed-hwe package in Ubuntu: In Progress Status in linux-signed-hwe package in Fedora: New Bug description: Touchpad 'Buttonless Mylar surface multi-touch touchpad' doesn't work at all (No response from the Touchpad) for notebook 'Lenovo Ideapad 5 14IIL05 81YH' from first system start on. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-29-generic 5.4.0-29.33 ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30 Uname: Linux 5.4.0-29-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tilman 1607 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Tue May 12 21:22:22 2020 InstallationDate: Installed on 2020-05-12 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: LENOVO 81YH ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic root=UUID=bb961a96-8855-4e50-814d-7994235377c3 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-29-generic N/A linux-backports-modules-5.4.0-29-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/25/2020 dmi.bios.vendor: LENOVO dmi.bios.version: DSCN23WW(V1.09) dmi.board.asset.tag: NO Asset Tag dmi.board.name: LNVNB161216 dmi.board.vendor: LENOVO dmi.board.version: No DPK dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: IdeaPad 5 14IIL05 dmi.modalias: dmi:bvnLENOVO:bvrDSCN23WW(V1.09):bd03/25/2020:svnLENOVO:pn81YH:pvrIdeaPad514IIL05:rvnLENOVO:rnLNVNB161216:rvrNoDPK:cvnLENOVO:ct10:cvrIdeaPad514IIL05: dmi.product.family: IdeaPad 5 14IIL05 dmi.product.name: 81YH dmi.product.sku: LENOVO_MT_81YH_BU_idea_FM_IdeaPad 5 14IIL05 dmi.product.version: IdeaPad 5 14IIL05 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1878279/+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
