Re: libata.force=1.5Gbps doesn't seem to work

[Roger Heflin]

Nick Craig-Wood wrote:
> Ever since I changed to AHCI (by fiddling with random options in the
> BIOS) my external SATA drive is being run at 3.0 Gbps.  However it
> doesn't seem reliable at that - maybe the cable is too long. (It is
> probably about 80cm in total - one standard SATA cable going to the
> case and another from the case to the drive).
>
> I read in Documentation/kernel-parameters.txt that a command line of
>
>   libata.force=1.5Gbps
>
> Should force all my SATA disks to 1.5 Gbps.
>
> However this doesn't seem to work.

I cannot help with the option not working, but you might see if the drives can 
be jumpered to force 1.5Gbps, I know a number of the manufacturers have jumpers 
to force 1.5Gbps since a number of older chipsets (Via sata and probably others) 
don't properly auto-neg 1.5Gbps on a 3.0Gbps drive, and fail to work at all.

                                 Roger
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/