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On 3/16/2013 6:59 PM, Guenter Roeck
wrote:
Apologies as this a bit OT, but hoping someone can help me understand what's happening here. It does appear that the Inspiron has a 3-pin connector. When I power up the box, it is very quiet for about 4 or 5 minutes. After that, the fan appears to go to 100% and never quiets down again. Even when I cpufreq-set to powersave and cap the max CPU freq at 2.0 GHz for all four cores (80% of max), it still stays loud indefinitely. I've opened up the box and cleaned out all dust and visually inspected the fans, and nothing appears awry. /sys/devices/virtual/thermal/thermal_zone0/temp consistently reports 40.0 degrees C i.e. 40000 (I'm actually suspicious of that number because it never seems to change). Any ideas for what I can do to troubleshoot why the fan is always running at full blast?Sorry -- typo above. It should say I can control *CPU* fans, but can't find any documentation as to how to control the *chassis* fan.On my motherboard, all fan headers have 4 pins, but there is a jumper to tell the board to treat the case fan headers as 3-pin. This is rather rare though, most motherboards have it hard-wiredThanks. I will check this. Before I open up my case, is there anywhere I can/should look in log files or /sys to see if the chassis fan is controllable? Would this be found in a different place than the CPU fans?No, it can't be seen from the logs nor /sys. Only hardware inspection can tell you, and not even in all cases.Inspiron 530 manual (downloadable) says that the processor fan has a 4-pin connector and the chassis fan has a 3-pin connector. Adam |
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