group.of.nepali.translators team mailing list archive

[Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>]

** 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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