Public bug reported:

Whenever I try to shutdown or reboot the system while the internal wifi
card is enabled, the systems hangs (system does not switch to command
line mode, only possible to reboot using Syrq-Key+B, even Sysrq+O does
not work). When I disable the wifi card using network manager before
shutting down it works fine. The system runs in UEFI mode.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-13-generic 4.15.0-13.14 [modified: 
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
 /dev/snd/controlC0:  joe        1448 F.... pulseaudio
CurrentDesktop: XFCE
Date: Thu Apr 12 17:36:34 2018
InstallationDate: Installed on 2018-04-09 (3 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180409)
MachineType: LENOVO 80X7
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic.efi.signed 
root=UUID=3ba7e23d-37e2-4bef-b60a-c7509a7b487c ro reboot=cold
 linux-restricted-modules-4.15.0-13-generic N/A
 linux-backports-modules-4.15.0-13-generic  N/A
 linux-firmware                             1.173
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install) 06/22/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: 4MCN22WW(V1.07)
dmi.board.asset.tag: NO Asset Tag Lenovo YOGA 720-15IKB
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo YOGA 720-15IKB
dmi:bvnLENOVO:bvr4MCN22WW(V1.07):bd06/22/2017:svnLENOVO:pn80X7:pvrLenovoYOGA720-15IKB:rvnLENOVO:rnLenovoYOGA720-15IKB:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYOGA720-15IKB: IDEAPAD 80X7
dmi.product.version: Lenovo YOGA 720-15IKB
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  Lenovo Yoga 720 does not shutdown with wifi enabled

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