Re: AHCI + ST3160023AS + NCQ problems

["Matheus Izvekov" <mizvekov@gmail.com>]

On 10/30/07, Matheus Izvekov <mizvekov@gmail.com> wrote:
> On 10/30/07, Michael Tokarev <mjt@tls.msk.ru> wrote:
> > Eric D. Mudama wrote:
> > > On 10/30/07, Michael Tokarev <mjt@tls.msk.ru> wrote:
> > >> By the way, did you forget to remove a jumper on the drive
> > >> (the only jumper installed by default) that limits drive
> > >> usage to SATAI?
> > > ...
> > >> ..etc.   Try again without the jumper?  Note that NCQ is NOT supported
> > >> in SATAI mode, or there were some pre-standard implementations of it.
> > >> In SATAII, NCQ is standard (well... more or less anyway ;)
> > >
> > > Huh?
> > >
> > > To my knowledge, the jumper should only limit the bus rate to
> > > 1.5Gbit/s, for compatibility with one or more chipsets.  It shouldn't
> > > affect the command set supported by the device.
> >
> > The thing is that I don't know.  I had some other probs with seagate
> > sata drives when the jumper was there.  So I learned a lesson -
> > always remove the jumper before using their drives.  I don't want
> > to test which other restrictions this and other drive families
> > apply when jumpered... ;)
> >
> > /mjt
> >
>
> Indeed removing the jumper of sdb made it be recognised as SATA2. But
> sdc, what the problem is really about, is neither SATA2, not has any
> jumper whatsoever. but both the manufacturer and libata claim it
> supports NCQ.
>

Anything i could do to help debug this? or perhaps it makes more sense
to just blacklist NCQ for this particular drive?