Re: 2.6.25 to 2.6.26-rc8 regression (related to ahci and acpi _GTF)

[Tejun Heo]

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.

Thanks.

-- 
tejun
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