Public bug reported:
[Impact]
On new systems that facilitate s2idle, we observed the power consumption raises
higher than long idle does during s2idle with Western Digital PC SN720 NVMe SSD
SDAPNTW-256G.
Short idle: 5.3
Long idle: 3.0
S2I: 5.07
[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 WD NVMe, it fixes the power consumption issue with no
regression. And the power consumption decreases to 1.66W during s2idle.
[Regression Potential]
Low, the patches only applied to specific nvme module, and from our test, the
system is still stable.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux-oem (Ubuntu)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Tags: originate-from-1805324 somerville
** Tags added: originate-from-1805324 somerville
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https://bugs.launchpad.net/bugs/1805775
Title:
PC SN720 NVMe WDC 256GB consumes more power in S2Idle than long idle
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