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    SubjectRe: linux-next: Tree for June 13: IO APIC breakage on HP nx6325
    On Friday, 20 of June 2008, Matthew Garrett wrote:
    > On Fri, Jun 20, 2008 at 01:53:58PM +0200, Rafael J. Wysocki wrote:
    > > What exactly I observe is that in this case:
    > > 1) The cooling fan is 100% on, as though the box were overheating, which seems
    > > to indicate some serious confusion of the platform (the mechanism turning
    > > the fan 100% on is supposed to be transparent to software).
    > > 2) Everything seems to slow down substantially, at least as soon as X is
    > > started.
    > What does ACPI claim the trip points are set to in this case? On the
    > 6125, if IRQ 2 is enabled in the APIC then the DSDT sets all the thermal
    > trip points to 16 degrees C. I suspect this means that enabling IRQ 2 is
    > the wrong thing to do on this chipset.

    Ah, indeed, thanks for the hint. This is the output of

    $ cat /proc/acpi/thermal_zone/TZ*/trip_points

    in the failing case:

    critical (S5): 105 C
    passive: 16 C: tc1=1 tc2=2 tsp=100 devices=C000 C001
    active[0]: 16 C: devices=C34F
    active[1]: 16 C: devices=C350
    active[2]: 16 C: devices=C351
    active[3]: 16 C: devices=C352
    critical (S5): 100 C
    passive: 16 C: tc1=1 tc2=2 tsp=300 devices=C000 C001
    critical (S5): 100 C
    passive: 16 C: tc1=1 tc2=2 tsp=300 devices=C000 C001

    (also available at:

    So, the observed slowdown may be a result of throttling.


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