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[Mark Standridge <mrstandridge@xxxxxxxxx>]

I have tested the attached patch against ubuntu kernels 3.13.0-58,
3.13.0-63, 3.13.0-64, and 3.13.0-65 for over a month. Never once has
this laptop suffered a kernel panic with the applied patch to reinstate
the optimization to stepwise.c. It has never failed to boot. As I said
earlier, I found the origin of the regression through a git bisect.

I also have tested the latest upstream kernel, version
4.3.0-040300rc3-generic #201509271225. It has no issue booting. Looking
at:

https://github.com/torvalds/linux/blob/master/drivers/thermal/step_wise.c

I see that the commit which introduces this issue has not been applied
upstream. Probably because commit
178c2490b99f898efc06d1ad75cadc84f13021a6 (thermal: step_wise: Revert
optimization) is not needed due to
8c8dd64345ba2a8c41556095c7adacb1c8af7c1 ("acerhdf: Use bang-bang thermal
governor") fixing the issue for the fan control upstream. So the issue
I'm experiencing is not so much fixed upstream, as rather it never
existed upstream.

I do have an old Acer Aspire 1410 which uses the acerhdf fan control
module if you would like assistance in testing a backport of
8c8dd64345ba2a8c41556095c7adacb1c8af7c1 ("acerhdf: Use bang-bang thermal
governor") to 3.13.0.

Ubuntu kernel 3.13.0-65-generic is still unable to reliably boot without
a kernel panic.

Thanks

** Attachment added: "reinstate the optimization to stepwise.c"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1482273/+attachment/4482285/+files/patch

** Tags added: patch

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https://bugs.launchpad.net/bugs/1482273

Title:
  Dell Ubuntu 3551: failure to boot without nolapic option

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This laptop came with Ubuntu 14.04 preinstalled. It is a Dell Inspiron
  3551 15" Ubuntu Laptop. A problem was introduced in the linux-
  image-3.13.0-58-generic kernel update which prevents the laptop from
  booting unless nolapic is added to the grub boot command. This problem
  persists in the current latest stable ubuntu kernel linux-
  image-3.13.0-61-generic. This bug affects a clean, factory restored
  install. The system passes all of Dell's included hardware diagnostic
  tests.

  Boot fails with:

  Kernel Panic - not syncing: Attempted to kill init!
  exitcode=0x00000009

  The following kernels are able to boot without issue:
  linux-image-3.13.0-57-generic
  linux-image-3.13.0-55-generic
  linux-image-3.13.0-38-generic

  Please let me know if I can be of further assistance.
  lsb_release: Ubuntu 14.04.3 LTS

  Thanks,

  Mark Standridge

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-61-generic 3.13.0-61.100
  ProcVersionSignature: Ubuntu 3.13.0-61.100-generic 3.13.11-ckt22
  Uname: Linux 3.13.0-61-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mark       2223 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Aug  6 10:24:22 2015
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-trusty-amd64-20140620-0
  HibernationDevice: RESUME=UUID=00b41433-b7f7-4ddb-83c4-fca2ea939b57
  InstallationDate: Installed on 2015-06-18 (48 days ago)
  InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20140620-04:25
  MachineType: Dell Inc. Inspiron 3551
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-61-generic root=UUID=a4f79951-02f5-41f5-aa89-e4f77082c51f ro nolapic quiet splash radeon.modeset=0 nouveau.modeset=0 video.use_native_backlight=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-61-generic N/A
   linux-backports-modules-3.13.0-61-generic  N/A
   linux-firmware                             1.127.14
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/05/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 0CMF7W
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd12/05/2014:svnDellInc.:pnInspiron3551:pvrA00:rvnDellInc.:rn0CMF7W:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 3551
  dmi.product.version: A00
  dmi.sys.vendor: Dell Inc.

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