Public bug reported:
A hardware vendor reported that NVMe didn't implement power management
correctly during shutdown/restart and suspend/resume as below:
=================================
However, when it comes to shutdown/restart, the Power Management Events (PME)
are not correctly implemented.
When the host (Linux/Driver) sends the PME_TURN_OFF message it should
wait for PME_TO_ACK from the device.
Microsoft Windows versions typically wait for 5 seconds.
The Linux OSes doesn't wait for the PME_TO_ACK from the device and
simply turns off the system instantly immediately after the
shutdown/restart.
This is not the way to treat PCIe storage devices. The host should allow the
device to properly shutdown. Otherwise the disk will go in to rebuild during
next power on which takes a while resulting in OS finding the device not
responding and disabling it and not loading the driver for it.
=================================
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Alex Hung (alexhung)
Status: In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1465136
Title:
NVMe shutdown and suspend delay time is too short
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