• Arjan van de Ven's avatar
    ACPI: fix High cpu temperature with 2.6.32 · 370d5cd8
    Arjan van de Ven authored
    Since the rewrite of the CPU idle governor in 2.6.32, two laptops have
    surfaced where the BIOS advertises a C2 power state, but for some reason
    this state is not functioning (as verified in both cases by powertop
    before the patch in .32).
    
    The old governor had the accidental behavior that if a non-working state
    was chosen too many times, it would end up falling back to C1.  The new
    governor works differently and this accidental behavior is no longer
    there; the result is a high temperature on these two machines.
    
    This patch adds these 2 machines to the DMI table for C state anomalies;
    by just not using C2 both these machines are better off (the TSC can be
    used instead of the pm timer, giving a performance boost for example).
    
    Addresses http://bugzilla.kernel.org/show_bug.cgi?id=14742Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
    Reported-by: <akwatts@ymail.com>
    Cc: <stable@kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    370d5cd8
processor_idle.c 31.3 KB