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my laptop (HP Pavillon DV5 1110el) has a big problem. The fan is always on and very loud (I think maximum speed).

For example, now the CPU temperature is just 40° but the fan is at maximum speed anyway. I know that for Linux you can use fancontrol. For Windows, the equivalent should be Speedfan but in my case it doesn't detect the fans.. I tried to patch the DSDT table following this guide, but I didn't find the fan instructions. As a guy said in this post.

Name(BCLT, Package(0xd) { 0x64, 0x32, Zero, 0xa, 0x14, 0x1e, 0x28, 0x32, 0x3c, 0x46, 0x50, 0x5a, 0x64 }) 

This code isn't about the fan speed but just about screen brightness levels.

The only thing that worked was to change "fun always on" to NO in the BIOS but this doesn't change the situation a lot because after reaching a certain temperature (65 degree I think) the fan start loud as before and this on/off of the fun is very very frequent...

Any idea of how to solve this problem? I don't want to take apart the laptop.

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Many of the HP laptops I've seen have had very noisy fans so I don't think yours is unusual. Has it always been quite as bad as this or has it got worse over time? You could try blowing the dust out of the vents using a can of compressed air. You should also check your power management profile advanced settings to make sure Minimum Processor State is set below 40% to lower the temperatures when the laptop is idle. I believe the Balanced profile typically has this set. Make sure that your Flash player is up to date as older versions could cause high CPU usage. Lastly consider a laptop cooler. –  James Jan 24 '12 at 10:35
    
Thanks for the answer. My laptop is 3 years old so I think there's a lot of dust. This noise has been loud sometimes but now it's always loud. I've already tried to set the Minimum Processor State to 10% but no relevant improvement. I've already triead a can of –  dsdt Jan 24 '12 at 11:59
    
compressed air but I think I need to disassembly the laptop to clean it better. The problem is that I need my laptop to work these days and I can't risk to break it disassemblying. Laptop cooler maybe can be the right solution –  dsdt Jan 24 '12 at 12:05
    
    
@dsdt: Have you noticed high CPU usage when the laptop is idle? –  James Jan 24 '12 at 12:42

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