** Changed in: linux-oem-5.6 (Ubuntu)
Status: New => Invalid
** Changed in: hwe-next
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1896598
Title:
Enable LTR for endpoints behind VMD
Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Won't Fix
Status in linux-oem-5.6 source package in Focal:
Fix Released
Status in linux source package in Groovy:
Fix Released
Status in linux-oem-5.6 source package in Groovy:
Invalid
Bug description:
[Impact]
PCIe links behind VMD may not be able to reach ASPM L1.2, because PCIe
Link Tolenrence Reporting doesn't get programmed with a sensible value.
[Fix]
Temporarily hardcode LTR value, which is used by Windows, for NVMe
devices behind VMD.
[Test]
With the patch applied, PCIe links can reach ASPM L1.2, hence the entire
Intel SoC can reach deeper power saving state.
[Regression Potential]
This patch targets specifically Intel Tigerlake VMD bridges, so there
won't be any regression since they are not on the market yet.
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