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    SubjectRe: ata_piix, laptop cdrom, ICH7: EH, limiting speed to PIO
    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?

    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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