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

[Rafael J. Wysocki]

[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.
> 
> 
> Device detection:
> 
> [    0.567684] ahci 0000:00:1f.2: version 3.0
> [    1.568027] ahci 0000:00:1f.2: AHCI 0001.0000 32 slots 4 ports 1.5 Gbps 0x5 impl IDE mode
> [    1.568091] ahci 0000:00:1f.2: flags: 64bit ncq pm led slum part 
> [    1.568695] ata1: SATA max UDMA/133 abar m1024@0xb8000c00 port 0xb8000d00 irq 19
> [    1.873016] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> [    1.874045] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 succeeded
> [    1.875000] ata1.00: ATA-7: HTS541010G9SA00, MBZOC60D, max UDMA/100
> [    1.875000] ata1.00: 195371568 sectors, multi 0: LBA48 NCQ (not used)
> [    1.875000] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 succeeded
> [    1.875000] ata1.00: configured for UDMA/100
> 
> Typical error:
> 
> [  499.178040] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> [  499.178105] ata1.00: cmd ca/00:3e:76:45:81/00:00:00:00:00/e1 tag 0 dma 31744 out
> [  499.178106]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
> [  499.178168] ata1.00: status: { DRDY }
> [  499.178220] ata1: hard resetting link
> [  499.942034] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> [  499.943540] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 succeeded
> [  499.946056] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 succeeded
> [  499.947174] ata1.00: configured for UDMA/100
> [  499.947174] ata1: EH complete
> 
> Full dmesg is attached.
> 



-- 
"Premature optimization is the root of all evil." - Donald Knuth
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