From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <liml@rtr.ca>
Subject: Re: hdparm -C on SATA always prints "standby"
Date: Mon, 16 Oct 2006 12:06:18 -0400
Message-ID: <4533ADFA.4000703@rtr.ca>
References: <200610161136.04754.len.brown@intel.com>
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To: Len Brown <lenb@kernel.org>
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> hdparm -C seems to work on the PATA laptops I have,
> but it always returns standby on the SATA laptops I have.
> 
> Is this a known issue?

Yes, due to incomplete implemetation of the HDIO_* ioctls in libata.
Somebody else posted a patch here recently to fix it.
I don't know if Jeff picked it up or not.

Cheers