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Sat, 26 Jan 2019 08:19:23 -0800

I tested a few kernels, and v4.12.14 is the last kernel that works
without noapic. Starting with v4.13-rc1 my computer will hang on boot
unless I use noapic.

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Title:
  Thinkpad T430u won't boot without noapic workaround

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I've used Ubuntu on this specific machine for years without problems,
  but starting with the 4.13 kernel that came with the 17.10 HWE and
  continuing into 18.04 kernels my computer would no longer boot,
  hanging at various screens:

  - A blank screen with a flashing cursor
  - A screen with this message:
  Loading Linux 4.13.0.36-generic ...
  Loading initial ramdisk ...
  - A screen with kernel messages, ending in:
  APCI: EC: interrupt blocked

  I've encountered the bug in a number of kernels, including:
  - 4.13.0-32
  - 4.13.0-36
  - 4.13.0-37
  - 4.15.0-24
  - 4.15.0-34
  - 4.15.0-36
  - 4.15.0-38
  - 4.15.0-42
  - 4.20.0-rc7

  I was able to work around the issue by adding noapic to
  GRUB_CMDLINE_LINUX_DEFAULT in /etc/default grub, e.g.:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash noapic"

  I'm not entirely sure of the consequences of this workaround, but one
  thing I've noticed is significantly reduced battery life.

  This bug seems very similar to what's described here for the Thinkpad
  E485/E585: https://evilazrael.de/node/401

  I'll attach screenshots of various times I've encountered this bug
  over the last year.

  $ lsb_release -rd
  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04

  $ apt-cache policy linux-image-4.15.0-42-generic
  linux-image-4.15.0-42-generic:
  ??Installed: 4.15.0-42.45
  ??Candidate: 4.15.0-42.45
  ??Version table:
  ?*** 4.15.0-42.45 500
  ????????500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
  ????????500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
  ????????100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-42-generic 4.15.0-42.45
  ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
  Uname: Linux 4.15.0-42-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  AudioDevicesInUse:
  ?USER        PID ACCESS COMMAND
  ?/dev/snd/controlC0:  bryan      2349 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Thu Dec 13 15:31:15 2018
  HibernationDevice: RESUME=UUID=4afa8032-cfe5-45f4-a626-738ab33904ac
  InstallationDate: Installed on 2014-05-08 (1680 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 3351CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-42-generic 
root=UUID=cffbc87d-956b-4986-94df-b3b64ae5237f ro quiet splash noapic 
vt.handoff=1
  RelatedPackageVersions:
  ?linux-restricted-modules-4.15.0-42-generic N/A
  ?linux-backports-modules-4.15.0-42-generic  N/A
  ?linux-firmware                             1.173.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-07-12 (154 days ago)
  dmi.bios.date: 06/01/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: H6ETA0WW (2.18 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 3351CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 STD DPK TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrH6ETA0WW(2.18):bd06/01/2018:svnLENOVO:pn3351CTO:pvrThinkPadT430u:rvnLENOVO:rn3351CTO:rvrWin8STDDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.family: ThinkPad T430u
  dmi.product.name: 3351CTO
  dmi.product.version: ThinkPad T430u
  dmi.sys.vendor: LENOVO

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