linux-kernel - Re: Hard Disk consumes lots of power in s2idle

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Date:   Wed, 19 Feb 2020 10:36:00 -0800
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Linux PM <linux-pm@...r.kernel.org>, linux-ide@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        Kent Lin <kent.lin@...onical.com>
Subject: Re: Hard Disk consumes lots of power in s2idle

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