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

[Sergey Dolgov <dolgovs@gmail.com>]

On Mon, Sep 17, 2007 at 09:18:26PM +0400, Alexey Zaytsev wrote:
> On 9/17/07, Sergey Dolgov <dolgovs@gmail.com> wrote:
> > On 9/17/07, Tejun Heo <htejun@gmail.com> 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?

No, that is not required. The problem shows up on a fresh start from
powered-off state just as well.

> 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?

I've been using 2.6.23 rcs (rc3, rc6) since August, often for days
without rebooting the machine. Haven't seen any lockups (except the
ones on a return from suspend-to-RAM, but that's another story).

--
Sergey