From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj@kernel.org>
Subject: Re: Question about ALPM, HIPM and DIPM
Date: Mon, 20 Apr 2009 16:44:14 +0900
Message-ID: <49EC27CE.2010300@kernel.org>
References: <ff05f3d00904152003s1938f20crec86c6d62a2ef3bf@mail.gmail.com>
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To: Edward Shao <laface.tw@gmail.com>
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Edward Shao wrote:
> Hi~folks,
> 
> I'm wondering about AHCI ALPM, SATA HIPM and DIPM.
> 
> * ALPM is HIPM for AHCI?

ALPM uses HIPM but there are other ways to achieve HIPM too (via
SControl).

> * If ALPM is enabled but SATA HDD does not support HIPM (only DIPM),
> ALPM is effective?

Nope.

-- 
tejun