Similar bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1507472/
The first time suspending works great but after that suspending causes the laptop to wake up regardless of the method used to suspend.
Workaround: use kernel 4.19.4.
Sidenote: thanks to penalvch for explaining how to report this!
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-13-generic 4.18.0-13.14
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: siilwyn 1852 F.... pulseaudio
/dev/snd/controlC1: siilwyn 1852 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 20 13:40:14 2019
InstallationDate: Installed on 2019-01-19 (1 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
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 003: ID 05ac:0274 Apple, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Apple Inc. MacBookPro11,5
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-13-generic root=UUID=57f2dc4c-30f7-40b6-a9db-9b6f93c214cb ro quiet splash vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.18.0-13-generic N/A
linux-backports-modules-4.18.0-13-generic N/A
linux-firmware 1.175.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/18/2017
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP114.88Z.0172.B25.1706181512
dmi.board.name: Mac-06F11F11946D27C5
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro11,5
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-06F11F11946D27C5
dmi.modalias: dmi:bvnAppleInc.:bvrMBP114.88Z.0172.B25.1706181512:bd06/18/2017:svnAppleInc.:pnMacBookPro11,5:pvr1.0:rvnAppleInc.:rnMac-06F11F11946D27C5:rvrMacBookPro11,5:cvnAppleInc.:ct9:cvrMac-06F11F11946D27C5:
dmi.product.family: MacBook Pro
dmi.product.name: MacBookPro11,5
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
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