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  1. Bug #760131
  2. Comment #150

Comment 150 for bug 760131

Revision history for this message
Colin Ian King (colin-king) wrote :

I suggest testing out the latest natty -proposed kernel, it contains commit 9ee653dce0efc6bad29f0d68b4ac74dbed093131

commit 9ee653dce0efc6bad29f0d68b4ac74dbed093131
Author: Tero Kristo <email address hidden>
Date: Thu Feb 24 17:19:23 2011 +0200

    cpuidle: menu: fixed wrapping timers at 4.294 seconds

    BugLink: http://bugs.launchpad.net/bugs/774947

    Cpuidle menu governor is using u32 as a temporary datatype for storing
    nanosecond values which wrap around at 4.294 seconds. This causes errors
    in predicted sleep times resulting in higher than should be C state
    selection and increased power consumption. This also breaks cpuidle
    state residency statistics.

    cc: <email address hidden> # .32.x through .39.x
    Signed-off-by: Tero Kristo <email address hidden>
    Signed-off-by: Len Brown <email address hidden>
    (cherry picked from commit 7467571f4480b273007517b26297c07154c73924)
    Acked-by: Stefan Bader <email address hidden>
    Signed-off-by: Tim Gardner <email address hidden>

This should fix a bug with incorrect C state selection which lead to increased power consumption.