** Changed in: linux (Ubuntu Bionic)
       Status: Incomplete => Triaged

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1775764

Title:
  Unable to switch VTs - screen frozen

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  Prior to doing any Gnome Shell development I always disable the
  existing instance by dropping back to a non-graphical runlevel:

    sudo systemctl start multi-user.target

  At least half the time this works. But the other half the time the
  screen freezes and I am not able to interact with it or switch VTs.
  Even a remote login can't force a VT switch:

    sudo chvt 4  # just hangs

  The kernel log shows no errors at all.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  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: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', 
'/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', 
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Fri Jun  8 13:21:38 2018
  InstallationDate: Installed on 2018-05-26 (12 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180525)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 17ef:6009 Lenovo ThinkPad Keyboard with TrackPoint
   Bus 001 Device 003: ID 045e:0047 Microsoft Corp. IntelliMouse Explorer 3.0
   Bus 001 Device 002: ID 8087:0a2b Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 10M7CTO1WW
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-22-generic 
root=UUID=d7ecc709-02c2-4413-b7e7-dfce1d2b3703 ro quiet splash vt.handoff=1
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-22-generic N/A
   linux-backports-modules-4.15.0-22-generic  N/A
   linux-firmware                             1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/06/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: M16KT47A
  dmi.board.name: 3102
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN 3259627060530
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrM16KT47A:bd02/06/2018:svnLENOVO:pn10M7CTO1WW:pvrThinkCentreM710s:rvnLENOVO:rn3102:rvrSDK0J40709WIN3259627060530:cvnLENOVO:ct3:cvrNone:
  dmi.product.family: ThinkCentre M710s
  dmi.product.name: 10M7CTO1WW
  dmi.product.version: ThinkCentre M710s
  dmi.sys.vendor: LENOVO

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