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[Kevin Brubeck Unhammer <1463422@xxxxxxxxxxxxxxxxxx>]

I got a tip from Navin at https://bugzilla.kernel.org/show_bug.cgi?id=118401 
to try acpi=noirq and this does not only let me boot kernels>=4.3 (I'm writing this from mainline 4.7!), but also makes it poweroff and restart correctly. 

However, it does not resume from suspend (it seems to suspend as it
should, but clicking the power button to turn it back on does nothing).

** Bug watch added: Linux Kernel Bug Tracker #118401
   http://bugzilla.kernel.org/show_bug.cgi?id=118401

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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.

  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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