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The fan won't slow down on my Dell Optiplex 760

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.


1 Answer

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!

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.

Check for bios upgrades and known acpi issues.

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

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.