[Bug 1804588] Re: Power consumption during s2idle is higher than long idle (Intel SSDPEKKF)

** No longer affects: linux (Ubuntu Xenial)

** Changed in: hwe-next
Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1804588

Title:
Power consumption during s2idle is higher than long idle (Intel
SSDPEKKF)

Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Status in linux source package in Disco:
Fix Released

Bug description:
[Impact]
On new systems that facilitate s2idle, we observed the power consumption raises higher than long idle does during s2idle with Intel NVMe SSDPEKKF.

Short idle: 6
Long idle: 2
S2I: 4.8

[Fix]
Windows doesn't put nvme to D3 in modern standby, and uses its own APST feature to do the power management. To leverage its APST feature during s2idle, we can't disable nvme device while suspending, too.
So, here is what we did on the driver, 1. prevent nvme from entering D3, 2. prevent nvme from being disabled when suspending.

[Test]
Verified on the new Intel NVMe, it fixes the power consumption issue with no regression. And the power consumption decreases to 2.8W during s2idle.

[Regression Potential]
Low, the patches only applied to specific nvme module, and from our test, the system is still stable.

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