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Your system will now run slightly hotter. This will prevent you from burning your system if you overdo the "silencing". Remarks: Do not change the top two fan speeds as they will act as "buffers" given by the manufacturer. You may get some warnings, but if you haven’t touched anyting beside the fan speeds, just ignore them! Enter the following in the command prompt window You need to be sure that you are actually changing fan speeds and nothing else!ġ4. Change the fanspeed as desired using the hexadecimal converterī. ( The text above and under may be different in different systems)ġ2. The "list" should contain around 5 numbers, all in 0x(hexadecimal) and ranging between 100 and 0 in descending order.Ī. You are looking for a "list" of numbers that starts with 100 and ends with 0. In the dsdt.ASL file, simply search for 0圆4. Thus, in the dsdt.ASL file 0 should look like 0x0ġ1. Moreover, you know that at some point the fan stops. The fan speeds are given as percentage in the DSDT table. You know that at some point your fan hits 100% of its speed. From now on you need a converter to convert decimal numbers to and from hexadecimal. (You may read about hexadecimal numbers in Wikipedia).ĩ. However, numbers are written in something like hexadecimals. If everything went fine, a new file named dsdt.ASL should be created in C:\ACPIĨ. copy dsdt.aml dsdtorig.aml (Creates a backup)ħ. Run command prompt using "Run as Administrator" and type the following:ī. If the file is not there, the directory or the key name you entered is not valid. If everything worked, a file named dsdt.aml should show up in C:\ACPI. It is a REG_BINARY and usually named "00000000". The key we are looking for is located within the subkey you found above. This is the actual key we are looking for where the fan speed information is loaded. Now you are prompted to enter the key name. Paste the directory into equus command windowĤ. Once you find the subkey, right click to "copy key name" (or something).ĭ. It is usually located approximately on the same directory. Easiest way to find it is to do the following:ī. This is the directory where your DSDT table is loaded in the registry. You will be prompted to enter the subkey path.
#Save dsdt windows install
Install Microsoft ASL Compiler and copy asl.exe from the install directory to C:\ACPI. Microsoft ASL Compiler (Latest version) You need the following software to compile:
#Save dsdt windows update
This procedure has to be repeated every time you update your BIOS.ĭownload equus.exe (right upper corner) to extract the DSDT table from registry (raw binary). (You may read more about DSDT in Wikipedia). This procedure involves patching your DSDT table and altering the fan speeds specified in the DSDT table. Warning: This procedure has the potential to damage your computer!
#Save dsdt windows how to
How to reduce fan noise on your HP notebook