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

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Message-Id: <0955D72C-D24D-402E-884F-C706578BF477@canonical.com>
Date:   Wed, 19 Feb 2020 22:22:48 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.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: Hard Disk consumes lots of power in s2idle

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