Re: ata_piix, laptop cdrom, ICH7: EH, limiting speed to PIO

[Alexey Zaytsev]

On 9/17/07, Sergey Dolgov <dolgovs@xxxxxxxxx> wrote:
> On 9/17/07, Tejun Heo <htejun@xxxxxxxxx> wrote:
>
> [...]
> > >>>> BTW, this only happens when using libata of course. The
> > >>>> old CONFIG_IDE stuff works fine every time.
> > >>> This maybe one of libata weirdness (I really don't get it why some hardware
> > >>> works perfectly fine with an old IDE and don't work well with libata).
> > >> Hmmm... Is MWDMA2 mode used with ide driver too?
> > >>
> > >
> > > What's the best way to tell whether it does or not? (the log says
> > > "selected mode 0x22", see below)
> >
> > Yes, that's MWDMA2.  Hmm... We're seeing many cases where MWDMA doesn't
> > work with libata while it works fine with IDE but have no idea what's
> > going on yet.  :-(
> >
>

This may be well a hardware problem. Same laptop (HP nx7300 GB848ES)
works fine with either 2.6.22 and 2.6.23-rc. Maybe actually using the
DVD is required to trigger the problem on the next reboot?

Sergey, btw, on this laptop I've observed lockups twice with the -rc5.
After switching to 2.6.22 it was stable for at least one day. Can you
confirm or refute this?
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