http://bugzilla.kernel.org/show_bug.cgi?id=14853
Summary: therm_adt746x might have inverted fan speed logic
Product: ACPI
Version: 2.5
Kernel Version: 2.6.32
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Power-Thermal
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
I just recently upgraded to .32 from .31 on my Powerbook 5,2. The fans worked
properly, as in, when it got warm it turned the fans on, when it got cold, it
turns the fans off.
However, .32 now turns the fans on soon as therm_adt746x is loaded, the fans
crank up to full throttle, even though the temperatures are at least 10 degrees
below sensor1_limit and sensor2_limit in /sys/devices/temperatures.
Trying to manually set the limits with echo -n foo > sensorn_limit to 20
degrees cooler (as opposed to warmer) causes the fans to shut off, but after
several minutes the box halts and powers off (probably triggering some safety
limit to prevent hardware damage).
I'm not sure how sensorn_fan_speed works, but the fans are at the their fastest
at 0, and medium speed at 91, and stopped altogether at 255.
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