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SubjectRe: [BUG 2.6.21-rc3-git9] SATA NCQ failure with Samsum HD401LJ
(linux-ide cc'ed)

Max Kellermann wrote:
> Hi,
> I have been trying to upgrade my 2.6.19 kernel for a while now,
> without success. All kernel versions since 2.6.20 failed with a
> timeout while trying to write to my SATA hard disk. After I wait for
> a while (during which all I/O to the hard disk blocks), the kernel
> message "NCQ disabled due to excessive errors" appears, and the system
> seems to work perfectly.
> My system is an Athlon64 X2 on an Asus A8N-Premium. I'm using the
> sata_nv driver for the on-board SATA controller. My only hard disk is
> a Samsum HD401LJ (400 GB).
> The kernel is build statically, and the only module is nvidia.ko. If
> someone believes it may make a difference, I can try the kernel
> without the proprietary module.
> Please see the kernel config and dmesg attached to this email.
> I don't know the libata subsystem well, but I suspect my hard drive
> has to be added to the NCQ blacklist.
> Max

This does indeed look like a drive side issue to me (the controller is
reporting CPBs with response flags 2 which as far as I can tell
indicates it's still waiting for the drive to complete the request).

Robert Hancock Saskatoon, SK, Canada
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