@kaihengfeng can you confirm this is resolved in -proposed groovy?

Thanks,
Ian

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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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