System hangs after shutdown or restart operation is initiated.

[Udit Pant]

When I attempt to turn off my laptop or restart it, the system hangs as it is. I then have to resort to force shutdown via the power button.

I've disabled my touchpad (since it doesn't work properly - probably a hardware issue) and therefore use an external mouse (Logitech M235).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-30-generic 4.15.0-30.32
ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: protagonist26 2204 F.... pulseaudio
 /dev/snd/controlC0: protagonist26 2204 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 7 12:36:21 2018
InstallationDate: Installed on 2018-07-27 (10 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: LENOVO 20354
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-30-generic root=UUID=3dad4d21-4cc3-4346-abae-fb6b8a4eee38 ro quiet splash acpi=force vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-30-generic N/A
 linux-backports-modules-4.15.0-30-generic N/A
 linux-firmware 1.173.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/10/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: 9BCN25WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lancer 5A5
dmi.board.vendor: LENOVO
dmi.board.version: 31900059STD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Z50-70
dmi.modalias: dmi:bvnLENOVO:bvr9BCN25WW:bd04/10/2014:svnLENOVO:pn20354:pvrLenovoZ50-70:rvnLENOVO:rnLancer5A5:rvr31900059STD:cvnLENOVO:ct10:cvrLenovoZ50-70:
dmi.product.family: IDEAPAD
dmi.product.name: 20354
dmi.product.version: Lenovo Z50-70
dmi.sys.vendor: LENOVO

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.18 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.18-rc8

[Udit Pant (protagonist26)]

For testing the latest kernel, I downloaded and installed the following .deb files (System is 64-bit):

linux-headers-4.18.0-041800rc8_4.18.0-041800rc8.201808052031_all.deb

linux-headers-4.18.0-041800rc8-generic_4.18.0-041800rc8.201808052031_amd64.deb

linux-image-unsigned-4.18.0-041800rc8-generic_4.18.0-041800rc8.201808052031_amd64.deb
(showed the 'missing dependencies' error on installation, therefore installed linux-modules)

linux-modules-4.18.0-041800rc8-generic_4.18.0-041800rc8.201808052031_amd64.deb

This resolved hanging of the system while shutting down/restarting. However, now I see a particular screen on startup (image attached) where I can spot the " [2.124104] ACPI Bios Error (bug) ". Is this something to be worried about?

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]