linux-kernel - Re: [PATCH] SATA / AHCI: Do not play with the link PM during suspend to RAM

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Message-ID: <AANLkTin2XPHXL_o9hHz9f4beTYEx+isX+PaFRkMMiYHQ@mail.gmail.com>
Date:	Tue, 17 Aug 2010 23:28:58 +0200
From:	Stephan Diestelhorst <stephan.diestelhorst@...il.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-pm@...ts.osdl.org" <linux-pm@...ts.osdl.org>,
	stephan.diestelhorst@....com
Subject: Re: [PATCH] SATA / AHCI: Do not play with the link PM during suspend
 to RAM

Hi,

2010/8/17 Tejun Heo <htejun@...il.com>:
> On 08/17/2010 12:51 PM, Stephan Diestelhorst wrote:
>> I *think* I have applied the patch correctly. Please find a copy of
>> "git show" in the build directory attached. This should be the right
>> thing, shouldn't it?
>
>> Maybe I forgot to speify a particular debug option / verbosity?
>
>> I've also confirmed that the "XXX ahci_set_ipm" is present in
>> libahci.ko. So either I've screwed up badly when compiling the initrd,
>> the code is not executed or the printout does not make it into any
>> logfile anymore.
>
> Yeah, that's weird.  You're enabling IPM, right?

Erm... Honestly, I have no clue. What is IPM? How do I enable it? This is a
Kubuntu Lucid 10.04 distribution, and I have not touched too much. In
particular, the kernels have been from upstream git, just with the Ubuntu config
copied over.

Maybe it is just not enabled? I am guessing that IPM might be IDE power
management? Or intelligent, integrated? Google turns up this email thread
as one of the first hits and nothing else conclusive.

Thanks,
  Stephan
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