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From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
To: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: Linux PM <linux-pm@vger.kernel.org>,
	linux-ide@vger.kernel.org,
	open list <linux-kernel@vger.kernel.org>,
	Kent Lin <kent.lin@canonical.com>
Subject: Re: Hard Disk consumes lots of power in s2idle
Date: Wed, 19 Feb 2020 10:36:00 -0800	[thread overview]
Message-ID: <a9fd25cd0a151d20e975ce79ab70197e39ef01e1.camel@linux.intel.com> (raw)
In-Reply-To: <0955D72C-D24D-402E-884F-C706578BF477@canonical.com>

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


  reply	other threads:[~2020-02-19 18:36 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-19 14:22 Hard Disk consumes lots of power in s2idle Kai-Heng Feng
2020-02-19 18:36 ` Srinivas Pandruvada [this message]
2020-02-20  8:08   ` Kai-Heng Feng
2020-02-20 10:12     ` Rafael J. Wysocki
2020-02-20 10:24       ` Kai-Heng Feng
2020-02-20 10:34         ` Rafael J. Wysocki
2020-02-20 11:21           ` Kai-Heng Feng

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