Addendum: Got lucky and the hardware was found at next boot. Does not happen often, though. For comparison, this is the dmesg log when it works as it should:
[ 0.000000] Linux version 4.15.0-22-generic (buildd@lgw01-amd64-013) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #24-Ubuntu SMP Wed May 16 12:15:17 UTC 2018 (Ubuntu 4.15.0-22.24-generic 4.15.17) [ ... ] [ 1.648084] usb 1-5: new full-speed USB device number 3 using xhci_hcd [ 1.798129] usb 1-5: New USB device found, idVendor=05ac, idProduct=0273 [ 1.798131] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1.798132] usb 1-5: Product: Apple Internal Keyboard / Trackpad [ 1.798133] usb 1-5: Manufacturer: Apple Inc. [ 1.798134] usb 1-5: SerialNumber: D3H63923PU1GHJGA36PF [ 1.803481] hidraw: raw HID events driver (C) Jiri Kosina [ 1.811234] usbcore: registered new interface driver usbhid [ 1.811235] usbhid: USB HID core driver [ 1.813483] input: Broadcom Corp. Bluetooth USB Host Controller as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:05AC:8290.0001/input/input5 [ 1.813672] apple 0003:05AC:0273.0003: hiddev0,hidraw0: USB HID v1.10 Device [Apple Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:14.0-5/input0 [ 1.813872] input: Apple Inc. Apple Internal Keyboard / Trackpad as /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.1/0003:05AC:0273.0004/input/input6 [ 1.872224] hid-generic 0003:05AC:8290.0001: input,hidraw1: USB HID v1.11 Keyboard [Broadcom Corp. Bluetooth USB Host Controller] on usb-0000:00:14.0-3/input0 [ 1.872322] input: Broadcom Corp. Bluetooth USB Host Controller as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.1/0003:05AC:8290.0002/input/input7 [ 1.932214] apple 0003:05AC:0273.0004: input,hiddev1,hidraw2: USB HID v1.10 Keyboard [Apple Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:14.0-5/input1 [ 1.932241] hid-generic 0003:05AC:8290.0002: input,hidraw3: USB HID v1.11 Mouse [Broadcom Corp. Bluetooth USB Host Controller] on usb-0000:00:14.0-3/input1 [ 1.932390] apple 0003:05AC:0273.0005: hiddev2,hidraw4: USB HID v1.10 Device [Apple Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:14.0-5/input3 [ 1.932500] apple 0003:05AC:0273.0006: hiddev3,hidraw5: USB HID v1.10 Device [Apple Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:14.0-5/input4 -- 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/1776266 Title: Touchpad and keyboard of MacBook unresponsive Status in linux package in Ubuntu: Confirmed Bug description: The touchpad and keyboard of my Macbook are unresponsive in Ubuntu 18.04. External USB devices are fine. At first it happened sporadically at boot or kicking in during operation, now it's a somewhat permanent state. In grub I can still use the keyboard, on the login screen not anymore. dmesg snippet of the relevant lines: [ 0.000000] Linux version 4.15.0-22-generic (buildd@lgw01-amd64-013) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #24-Ubuntu SMP Wed May 16 12:15:17 UTC 2018 (Ubuntu 4.15.0-22.24-generic 4.15.17) [ ... ] [ 1.644120] usb 1-5: new full-speed USB device number 3 using xhci_hcd [ 1.772223] usb 1-5: device descriptor read/64, error -71 [ 2.008240] usb 1-5: device descriptor read/64, error -71 [ 2.244154] usb 1-5: new full-speed USB device number 4 using xhci_hcd [ 2.372240] usb 1-5: device descriptor read/64, error -71 [ 2.608239] usb 1-5: device descriptor read/64, error -71 [ 2.716180] usb usb1-port5: attempt power cycle [ 3.368155] usb 1-5: new full-speed USB device number 5 using xhci_hcd [ 3.368385] usb 1-5: Device not responding to setup address. [ 3.576372] usb 1-5: Device not responding to setup address. [ 3.784150] usb 1-5: device not accepting address 5, error -71 [ 3.912155] usb 1-5: new full-speed USB device number 6 using xhci_hcd [ 3.912397] usb 1-5: Device not responding to setup address. [ 4.120389] usb 1-5: Device not responding to setup address. [ 4.328154] usb 1-5: device not accepting address 6, error -71 [ 4.328190] usb usb1-port5: unable to enumerate USB device Apparently touchpad and keyboard are connected internally via USB? This happens with the current Ubuntu generic kernel (4.15.0-22) as well as vanilla upstream kernel 4.17. In fact, it happened already with Ubuntu 16.04 and whatever the recent kernel there was. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-22-generic 4.15.0-22.24 ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17 Uname: Linux 4.15.0-22-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ole 2200 F.... pulseaudio /dev/snd/controlC0: ole 2200 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Mon Jun 11 19:25:07 2018 InstallationDate: Installed on 2018-06-01 (10 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 05ac:8290 Apple, Inc. Bus 001 Device 031: ID 04d9:1603 Holtek Semiconductor, Inc. Keyboard Bus 001 Device 030: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Apple Inc. MacBookPro12,1 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-22-generic root=UUID=28bf4396-f8c7-4936-9d45-d970c49ef1f3 ro resume=/dev/disk/by-uuid/28bf4396-f8c7-4936-9d45-d970c49ef1f3 resume_offset=34816 quiet splash vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-4.15.0-22-generic N/A linux-backports-modules-4.15.0-22-generic N/A linux-firmware 1.173.1 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/09/2018 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP121.88Z.0176.B00.1804091715 dmi.board.name: Mac-E43C1C25D4880AD6 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro12,1 dmi.chassis.type: 9 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-E43C1C25D4880AD6 dmi.modalias: dmi:bvnAppleInc.:bvrMBP121.88Z.0176.B00.1804091715:bd04/09/2018:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6: dmi.product.family: MacBook Pro dmi.product.name: MacBookPro12,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. 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