Kernel Bug Tracker – Bug 1359
Fan is being turned on and off in 6 secs intervals
Last modified: 2004-05-30 14:48:12 UTC
Hardware Environment: ASUS L3800C, 1GB RAM, Pentium 4M
is set to passive, temperature is between 74-76 oC, fan is being turned on and
off evry about 6 seconds. To solve the problem temporarily is to set cooling
mode to active. Then the fan cools system for a some longer time that 6 seconds,
but something in acpi triggers the cooling mode to passive and then again fan is
turned on and off like crazy:
vrapenec root # cat /proc/acpi/thermal_zone/THRM/trip_points
critical (S5): 95 C
passive: 75 C: tc1=1 tc2=1 tsp=100 devices=0xc1c3defc
active: 90 C: devices=0xc1c30efc
vrapenec root # cat /proc/acpi/thermal_zone/THRM/temperature
temperature: 76 C
vrapenec root #
Steps to reproduce:
Martin, as I have mentioned before, the DSDT can't control the real fan (I
mean the hardware) at all in your machine. I guess if you strip ACPI, you will
get the same symptom.
Please boot with acpi=off and see if the fan does the same thing
and the Linux ACPI code has nothing to do with this --
or if the Linux ACPI code is implicated.
If Linux ACPI code is implicated, please attach acpidmp and dmesg output.