This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verification-needed-xenial' to 'verification-failed-
xenial'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
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** Tags added: verification-needed-xenial

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https://bugs.launchpad.net/bugs/1836031

Title:
  [SRU][B/B-OEM]Fix resume failure on some TPM chips

Status in HWE Next:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  SRU justification:

  [Impact]
  System will reboot when resume from S3 with some TPM chips installed.

  [Fix]
  stable patch is merged in 4.15 kernel:
  888d867df441 (tpm: cmd_ready command can be issued only after granting 
locality)
  it needs a fix:
  tpm: separate cmd_ready/go_idle from runtime_pm
  these 2 patches fix the issue and enable tpm resume
  after seprating cmd_ready/go_idle.

  [Test]
  Verified on hardware. resume from S3 about 30 times with positive result.

  [Regression Potential]
  Medium, stable patches backported. Verified on hardware.
  backported with minor adjustion.

  These 2 patches are included in 4.18 and 5.0 kernel, only 4.15 needs
  them.

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