** Tags removed: verification-needed-cosmic
** Tags added: verification-done-cosmic

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1804588/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to     : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to