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    SubjectRe: 2.6.19-rc4-mm1: noidlehz problems
    On Wed, 2006-11-01 at 15:22 +0000, Matthew Garrett wrote:
    > On Wed, Nov 01, 2006 at 02:02:57PM +0100, Arjan van de Ven wrote:
    > > In some (hardware) C-states, the local apic timer stops (as does the
    > > TSC), while in others it keeps running. If you change from AC to
    > > battery, the bios can change the meaning of a software C-state from one
    > > where local apic timer keeps going to one where it stops. This obviously
    > > upsets the hrtimers/tickless code since that uses local apic timer for
    > > event generation....
    > Is there any hope of working around this? I'd have expected that the
    > most useful case for the tickless code was also the case where we want
    > to be using C3/C4...

    Can you try the following patches please ?

    This addresses the C34/C4 issue


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