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-
groovy' to 'verification-done-groovy'. If the problem still exists,
change the tag 'verification-needed-groovy' to 'verification-failed-
groovy'.

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
to enable and use -proposed. Thank you!


** Tags added: verification-needed-groovy

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.6 in Ubuntu.
https://bugs.launchpad.net/bugs/1900847

Title:
  Fix non-working Intel NVMe after S3

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.6 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Fix Committed
Status in linux-oem-5.6 source package in Focal:
  Fix Committed
Status in linux source package in Groovy:
  Fix Committed
Status in linux-oem-5.6 source package in Groovy:
  Invalid

Bug description:
  [Impact] 
  Intel NVMe has a 10% chance to stop working after S3.

  [Fix]
  Enable ACS quirk on Intel CML root port.

  [Test]
  With the patch applied, Intel NVMe mostly works after S3. There's still a
  1/1000 chance the issue happens. Intel is investigating the root cause.

  [Regression Potential]
  ACS works at hardware level, so I can't really assess the risk of
  regression. Since Intel confirmed CML also needs ACS quirk, we can only
  trust them until they devise a real fix.

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