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[Kevin Brubeck Unhammer <1463422@xxxxxxxxxxxxxxxxxx>]

linux-image-4.7.0-040700rc2-generic_4.7.0-040700rc2.201606051831_amd64.deb
though the 4.4.0-24.43 from regular xenial repos also booted fine with acpi=noirq

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https://bugs.launchpad.net/bugs/1463422

Title:
  [Lenovo IdeaCentre A740] Doesn't poweroff on shutdown

Status in linux package in Ubuntu:
  Triaged

Bug description:
  With my Haswell based Lenovo IdeaCentre A740, if I do "systemctl poweroff" or use any GUI to try to shut down, it gets to the stage of:
  [ OK ] Reached target Shutdown
  reboot: System halted

  but just sits there unresponsive, and does not actually power down.

  Similarly, if I try running "fwts -P", the hibernate test seems like
  it crashes the computer (screen is on but unresponsive), then if I
  click the power button twice, it resumes from hibernation just fine.

  If I try to reboot, it's almost the same, except the display shows
  weird psychedelic lines and colours, but everything is unresponsive
  and I have to click (and this time *hold* not just simple click) the
  power button.

  I can reboot fine from GRUB with ctrl+alt+delete. I've kept the
  Windows partition that came with the computer, that also powers down
  and reboots fine.

  If I click the power button while Ubuntu is started, it powers off
  immediately.

  I originally asked a question at
  https://askubuntu.com/questions/632591/system-does-not-power-off-on-
  poweroff-just-halts but I don't think it has an answer since this
  seems more likely to be a kernel bug.

  WORKAROUND: Use kernel parameter:
  acpi=noirq

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-18-generic 3.19.0-18.18
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  kiwibird   1481 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Tue Jun  9 15:41:05 2015
  HibernationDevice: RESUME=UUID=dc4226ca-3ebe-4611-95ac-c1a0ccbb7d7a
  InstallationDate: Installed on 2015-06-04 (5 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  MachineType: LENOVO F0AM
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic.efi.signed root=UUID=91533e8a-b5ca-4447-8c4a-b5bb2d095238 ro noprompt persistent
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-18-generic N/A
   linux-backports-modules-3.19.0-18-generic  N/A
   linux-firmware                             1.143.1
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  StagingDrivers: r8723au
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/30/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: O00KT19AUS
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058 STD
  dmi.chassis.type: 13
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnLENOVO:bvrO00KT19AUS:bd09/30/2014:svnLENOVO:pnF0AM:pvrLenovoA740:rvnLENOVO:rnINVALID:rvr31900058STD:cvnLENOVO:ct13:cvrChassisVersion:
  dmi.product.name: F0AM
  dmi.product.version: Lenovo A740
  dmi.sys.vendor: LENOVO

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