Public bug reported:
[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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1804588
Title:
Power consumption during s2idle is higher than long idle (Intel
SSDPEKKF)
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