This is likely a duplicate of https://bugs.launchpad.net/bugs/1878279
The current upstream resolution to this problem is https://git.kernel.org/linus/d341838d776a ("x86/PCI: Disable E820 reserved region clipping via quirks"), which relies on quirks that match DMI Vendor, Product Version, Product Name, and Board Name. This isn't an ideal solution because there are likely other systems we don't know about that need a similar fix. The patch I'm attaching here is an experimental idea to work around this issue without the maintenance burden of the quirks. If anybody would be willing to test this patch, I would be very grateful. To test it, apply this patch to your kernel, boot with "pci=use_e820 efi=debug", and collect the dmesg log. ** Attachment added: "experimental patch to remove EfiMemoryMappedIO" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1931715/+attachment/5632131/+files/remove-mmio -- 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/1931715 Title: [Lenovo Ideapad S145 82DJ0001BR] touchpad not working - does not appear on "cat /proc/bus/input/devices" Status in linux package in Ubuntu: Confirmed Bug description: Laptop model: Lenovo Ideapad S145 82DJ0001BR Manufacturer of the Touchpad: Elan, Synaptics When the symptom first appeared: At the time I installed Ubuntu on my notebook (dual-boot) - it works fine on Windows. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.8.0-55-generic 5.8.0-55.62~20.04.1 ProcVersionSignature: Ubuntu 5.8.0-55.62~20.04.1-generic 5.8.18 Uname: Linux 5.8.0-55-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.18 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Fri Jun 11 11:58:39 2021 InstallationDate: Installed on 2021-06-09 (1 days ago) InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1) SourcePackage: linux-signed-hwe-5.8 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1931715/+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
