![]() I wanted to mention that I stopped using SpeedFan to manage the fans. To restore everything back to the original state, you must fully shut down the system. When you disable EC control of the fans, this appears to stick past reboots (unless you go into the BIOS setup and make a change). The projects linked above have reference to it so I kept it in.Įdit One user reports being locked to a low CPU clock speed with the "regular" method, but not with the "alternate" method (Example: ec-disable-alt)The purpose and behavior of the "alternate method" is unknown to me but it might help if you find that the "regular" method does not work. (RPMs are reported via status/error code)Īfter EC fan control is off, you may use:Īppend "-alt" to EC disable or enable commands to attempt alternate method. The easiest way is to apply this registry change:Įc-disable Turn EC fan control off (fan goes to manual control)Įc-disable-nofanchg Turn EC fan control off and don't change the fan speedĮc-enable Turn EC fan control on (fan goes to automatic control)Īnd record the fan RPM at different levels. However, because the driver does not have an EV certificate from Microsoft, it will not load if UEFI secure boot is enabled so you must take additional steps. I purchased a digital code-signing certificate to sign the Dell SMM I/O driver by 424778940z so that "test signing mode" or the "disable driver signature enforcement" option is not required. (You still will need to make the registry change mentioned below.) Replacing bzh_dell_smm_io_圆4.sys with the version from the DellFanCmd download will allow it to run without test signing mode enabled. If you'd rather use a GUI app, you can use the one from the original thread. This guide assumes you are at least a little bit command-line savvy. (There are reports of BSOD with Windows 7, you might need Windows 10.) It should work with virtually all modern Dell laptops (with Intel Core 2nd gen / Sandy Bridge CPU or newer). The list of systems with confirmed support can be found in this post. For example, in the Precision 7530, setting the speed to "100%" puts the fans at 4200 RPM, but if the EC is in charge of the fans and the system is under load it may push the fans up to 4800 RPM. Also note that the fans' actual maximum speed may be higher than what you get if you set the speed to "100%". Some systems have more granular fan control while the EC is in charge, but you cannot change the behavior other than picking a thermal profile in Dell Power Manager. Note that without the EC controlling the fans, only three fan levels are available, which I will call "0%", "50%", and "100%". You can set up your own temperature thresholds for fan behavior based on your own preferences. Once this is done, a tool like SpeedFan or Hwinfo64 can be used to control the laptop fans. This tool basically just allows you to tell the EC (embedded controller) in the laptop to let go of fan control. If you have found this tool helpful and would like to consider chipping in a few bucks, send me a PM. ![]() I will remove this line once the cost has been offset. I have already received donations, and the remaining amount is $15. Note: I am interesting in offsetting the cost of the certificate used to sign the driver, which was $75. There is prior discussion of these tools as well as development chatter about this tool in this thread:Ĥ24778940z's tools seem to be derived from Linux work done on fan control, including the "i8k" driver, and these projects: This project uses the SMM I/O driver developer by 424778940z and is derived from the "Dell fan utility" GUI app, also by 424778940z. Old, unmaintained C++ version is available at. This program is part of a suite of tools called DellFanManagement. A command-line app that allows you to take over fan control in many Dell laptop/notebook computers.
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