After upgrading to Ubuntu 19.10 the boot hangs on HP EliteDesk 800 G2
SFF, previous kernel 5.0.0-31-generic works

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  Kernel panic in tpm_ functions when booting kernel 5.3 in Ubuntu 19.10
  (but 5.2 works)

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  SRU Justification

  Impact: Some systems are getting kernel panics during boot while
  parsing tpm event logs from the firmware. This happens only when the
  tpm and secure boot are both enabled in the firmware.

  Fix: 3 patches which are currently applied to the upstream EFI
  maintainer tree.

  Test Case: On an affected system, booting a 5.3-based kernel will
  panic during boot when the tpm and secure boot are enabled. A patched
  kernel will boot successfully. The patches have been verified to fix
  the issue on a gen 6 Lenovo X1 Carbon.

  Regression Potential: If the patches have bugs they could cause
  regressions on systems not currently experiencing issues. The patches
  are pretty straightforward though, so I believe the risk is minimal
  and (given the severity of the issue on affected hardware) acceptable.


  Device: Dell XPS 13 7390 (201908-27305)

  When trying to start the live session ("try Ubuntu") or trying to
  install the ISO ("install Ubuntu"), the boot process stops within 1
  second with a kernel panic (see attached screenshot).

  The system could boot with a previous version of Eoan image:
  2019-09-09 09:11 (kernel 5.3.0-10)

  Workaround: disable TPM2 in the BIOS.

  /!\ Please note: the information below (and the attached file  
ProcCpuinfoMinimal.txt) come from a 18.04 live session, since I cannot boot 
anything with 19.10 beta image.
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: syslinux 3:6.03+dfsg1-2
  ProcVersionSignature: Ubuntu 5.0.0-23.24~18.04.1-generic 5.0.15
  Uname: Linux 5.0.0-23-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  CasperVersion: 1.394
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Sep 26 07:41:16 2019
   gcc-8-base 8.3.0-6ubuntu1~18.04.1
   libc6 2.27-3ubuntu1
   libgcc1 1:8.3.0-6ubuntu1~18.04.1
   mtools 4.0.18-2ubuntu1
   syslinux-common 3:6.03+dfsg1-2
  LiveMediaBuild: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
   PATH=(custom, no user)
  SourcePackage: syslinux
  UpgradeStatus: No upgrade log present (probably fresh install)

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