[Bug 2034504] Re: Enable ASPM for NVMe behind VMD

** Changed in: linux (Ubuntu Jammy)
Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/2034504

Title:
Enable ASPM for NVMe behind VMD

Status in OEM Priority Project:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Won't Fix
Status in linux-oem-6.1 source package in Jammy:
Fix Released
Status in linux-oem-6.5 source package in Jammy:
Fix Released
Status in linux source package in Lunar:
Fix Released
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux-oem-6.5 source package in Lunar:
Invalid
Status in linux source package in Mantic:
Fix Released
Status in linux-oem-6.1 source package in Mantic:
Invalid
Status in linux-oem-6.5 source package in Mantic:
Invalid

Bug description:
[Impact]
ASPM of NVMe behind VMD is not enabled when BIOS FADT doesn't allow ASPM to be modified.
That causes higher overall power consumption.

[Fix]
Allow ASPM to be enabled.
While at this, remove old cruft that can interfere upstream VMD driver.

[Test]
Check the value of `/sys/kernel/debug/pmc_core/slp_s0_residency_usec`. Now system can reach deepest power saving state during sleep.

[Where problems could occur]
Some NVMe may have I/O issue when ASPM is enabled. But for this scenario the issue will also appear when VMD is disabled.

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