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[Bug 1499421] Re: kernel panic on boot after upgrade to ubuntu 15.10


since 3 weeks I have tried to track the reasons for a kernel panic I had with my Thinkpad T450s.

Unfortunately, the panic happen only one in many hours and isolating the
true reasons was very difficult. I'm quite sure now that it's not
related to intel graphics nor the intel wifi driver (graphics was my
ideal suspect).

What I have found (95% certitude):
- the panic occur only on when on battery
- removing the TLP package solve the issue (so, it's probably a driver flag set by TLP that causes the issue)
- Upgrading to upstream kernel 4.3RC4/5 definitely solve the problem.

FYI: when the panic occurs, the screen/image completely freezes, no
kernel logs, no magic key working.

Hope it helps !

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  kernel panic on boot after upgrade to ubuntu 15.10

Status in linux package in Ubuntu:
Status in linux source package in Wily:

Bug description:
  the installed Kernel in the release upgrade to the development line of ubuntu 15.10 creates a kernel panic on my 
  Lenovo yoga 2 pro

  the previously isntalled ubuntu 15.04 Kernel does still boot.

  Ubuntu Release:
  Description:	Ubuntu Wily Werewolf (development branch)
  Release:	15.10

  Clean Upgrade to 150.10 development branch

  happend instead:
  system got updated but dropped to a non responding cmd
  after a reboot i have a blinking caps lock
  after selecting an old kernel (and not the 4.2) it boots...

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.6
  ProcVersionSignature: Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.18.1-0ubuntu1
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Thu Sep 24 16:55:16 2015
  InstallationDate: Installed on 2015-04-25 (152 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
   PATH=(custom, no user)
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to wily on 2015-09-24 (0 days ago)

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