linux-kernel - Re: 2.6.25 to 2.6.26-rc8 regression (related to ahci and acpi

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Date:	Wed, 02 Jul 2008 11:04:16 +0200
From:	Mathieu Bérard <Mathieu.Berard@...ns.org>
To:	Tejun Heo <htejun@...il.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, Jeff Garzik <jeff@...zik.org>
Subject: Re: 2.6.25 to 2.6.26-rc8 regression  (related to ahci and acpi _GTF)

Tejun Heo a écrit :
> Rafael J. Wysocki wrote:
>   
>> [Adding CCs.]
>>
>> On Tuesday, 1 of July 2008, Mathieu Bérard wrote:
>>     
>>> Hi,
>>> I have a laptop with an ICH6M SATA Controller and a Hitachi hard drive.
>>> While it worked well using the ahci module and Linux 2.6.25, 
>>> it get randomly 'stuck' for several seconds to several minutes with 2.6.26-rc8.
>>> Successive errors progressively reduce the ATA link speed.
>>>
>>> Passing the libata.noacpi parameter is an effective workaround.
>>>
>>> Please note that it's not the first time i have this kind of issue, see:
>>> http://marc.info/?l=linux-ide&m=117305595312399&w=2
>>> This was found to be a bad interaction between my _GTF taskfile, which enable the
>>> "Enable Device-Initiated Interface Power State Transitions" feature, and NCQ.
>>> The driver was later NCQ blacklisted to correct the problem.
>>>       
>
> Can you please post the result of "hdparm -I /dev/sda" and full kernel
> boot log?  0xca is not a NCQ command so the it's not related to NCQ at
> all.  It seems we'll need to filter out DIPM commands from _GTF.
>
>   
Hi,
hdparm and dmesg output attached.

I was not expecting anything related to NCQ as my drive is blacklisted,
I was just mentioning previous issue with that hardware.

Do you know what has changed in this version that is now causing failure
with DIPM ?  I could bisect to try to find out, but this will be painful
as the
device hang may only appears after several minutes of disk activity.


-- 
Mathieu


View attachment "hdparm_2.6.26-rc8" of type "text/plain" (2423 bytes)

View attachment "dmesg_2.6.26-rc8" of type "text/plain" (49173 bytes)