Hard Disk consumes lots of power in s2idle

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To: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Subject: Hard Disk consumes lots of power in s2idle
From: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
Date: Wed, 19 Feb 2020 22:22:48 +0800
Cc: Linux PM <linux-pm@xxxxxxxxxxxxxxx>, linux-ide@xxxxxxxxxxxxxxx, open list <linux-kernel@xxxxxxxxxxxxxxx>, Kent Lin <kent.lin@xxxxxxxxxxxxx>

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?

Kai-Heng

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