Hi Kai,

On Wed, 2020-02-19 at 22:22 +0800, Kai-Heng Feng wrote:

Hi Srinivas,

Your previous work to support DEVSLP works well on SATA SSDs, so I am
asking you the issue I am facing:
Once a laptop has a HDD installed, the power consumption during
S2Idle increases ~0.4W, which is quite a lot.
However, HDDs don't seem to support DEVSLP, so I wonder if you know
to do proper power management for HDDs?

What is the default here
cat /sys/power/mem_sleep
s2idle or deep?

Please follow debug steps here:
https://01.org/blogs/qwang59/2018/how-achieve-s0ix-states-linux

We need to check whether you get any PC10 residency or not.

Thanks,
Srinivas

Kai-Heng