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
