Public bug reported:
[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.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: High
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: High
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Focal)
Importance: High
Status: Confirmed
** Affects: linux (Ubuntu Groovy)
Importance: High
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Groovy)
Importance: Undecided
Status: Invalid
** Tags: oem-priority originate-from-1892969 stella
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Groovy)
Status: New => Confirmed
** Changed in: linux-oem-5.6 (Ubuntu Groovy)
Status: New => Invalid
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => High
** Changed in: linux (Ubuntu Groovy)
Importance: Undecided => High
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided => High
** Tags added: oem-priority originate-from-1892969 stella
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https://bugs.launchpad.net/bugs/1900847
Title:
Fix non-working Intel NVMe after S3
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