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    SubjectRe: [1/6] 2.6.21-rc4: known regressions

    there's a new post-rc4 regression: my T60 hangs during early bootup. I
    bisected the hang down to this recent commit:

    | commit 25496caec111481161e7f06bbfa12a533c43cc6f
    | Author: Thomas Renninger <trenn@suse.de>
    | Date: Tue Feb 27 12:13:00 2007 -0500
    |
    | ACPI: Only use IPI on known broken machines (AMD, Dothan/BaniasPentium M)

    undoing this change fixes my T60 so it correctly boots again.

    the commit has this confidence-raising comment:

    | However, I am not sure about the naming of the parameter and how it
    | could/should get integrated into the dyntick part
    | (CONFIG_GENERIC_CLOCKEVENTS). There, a more fine grained check (TSC
    | still running?, ..) is needed?

    could we please revert this commit until it's done correctly?

    and did this end up being a 'fix'? The change weakens the scope of a
    hardware workaround, which IMO has no place so late in the cycle. At a
    minimum the clockevents maintainer (Thomas) should have been Cc:-ed on
    it.

    Ingo
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