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I have a new Optiplex 760 running Slackware v13 (x64). The power supply fan comes full on when I turn on the box and never slows down. I'm expect it to slow down after it senses the load/heat, but it never does.

This PC runs the latest Intel chipset (1Ch10).

I've loaded the kubuntu 9.04 live cd and had the same problem. Could there be a bad sensor some where or do I have a config problem.

\\Greg

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migrated from serverfault.com Sep 16 '09 at 10:34

This question came from our site for system and network administrators.

    
Have you checked whether there is a BIOS upgrade available that could address this? – mas Sep 16 '09 at 8:00
    
Thanks for the reminder to check. I upgraded the BIOS about 45 days ago and verified tonight that it is the latest – uSlackr Sep 17 '09 at 3:42
up vote 1 down vote accepted

I've got good news and bad news... The good news is you're not the only person having problems with Dell PSU fans and THERE IS A FIX. We recently purchased a few dozen Dell 760s and three of them had loud (high RPM) PSU fans. The bad news is Dell had to send a tech to replace all the PSUs with this problem.

I hope this helps!

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Indeed, a year later I swapped out the power supply and it got better :-) – uSlackr Dec 15 '10 at 1:43

Have you checked the BIOS for fan settings? Try looking for BIOS upgrades and giving the fan a good clean.

Some BIOS settings can change the speed of the fan dependant on the heat of the temperature. I had a similar issue with an extremely loud south bridge fan that clunked - it ran up to 4000 RPM when >40deg C - and it usually run at 42deg C. A quick change of the BIOS to only rack up to said speed at 45deg C and it was no longer an issue.

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There is a BIOS setting for FAN Override, but I've verified that it is off (with it on the CPU fan really got moving!) To clarify, thi sis the powersupply fan. I tried swapping out the power supply to no avail – uSlackr Sep 17 '09 at 3:35

Check for bios upgrades and known acpi issues.

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BIOS is verified latest. How do I find acpi issues? – uSlackr Sep 17 '09 at 3:47

get a hoover and hoover out the dust. that should slow it down ;-)

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1  
Beware static electricity that vacuums can generate! – David Mackintosh Sep 16 '09 at 20:35

You may need to build a new kernel with some ACPI BIOS settings enabled. I used to have the same problem running Slackware 11-12 on my desktop.

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