** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: Incomplete
** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu Cosmic)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
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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:
New
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
New
Status in linux source package in Bionic:
In Progress
Status in linux source package in Cosmic:
In Progress
Status in linux source package in Disco:
In Progress
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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