[Guide] How to control fans on Dell Laptops under Windows

Maybe some specialist could dig deep into drivers to find a way to directly pilot FANs ...
But as far as I know, actual control is made by sending PWM command to internal piece of hardware that controls FANs.

And this is this piece of hardware that do not allow a fully linear control.

The default Dell FAN manager is implemented into the BIOS (or another HW component), thus having a more direct access to FANs, and thus being allowed to control RPMs more precisely.
Dell FAN manager is able to set FANs at 2200rpm on my 7577, value that neither SpeedFan nor HWinfo64 can achieve (min value is 2500rpm at 35% PWM).

 

I think this is my first post on the forum. Sorry, but I've been lurking a lot
I dug into this stuff for like few hours and found out dell's CCTK; there was a command lind tool/exe that allows you to enable/disable settings in BIOS through the exe.

the options that are relevant to this stuff (disabling fan control/fan speed control) seems to be fanctrlovrd and fanspeed.
typing "cctk --fanctrlovrd disable" (disables fan speed control) gives you "usage error" output; also typing "cctk --fanspeed low" gives you same error message.
most importantly, doing cctk --fanspeed and cctk --fanctrlovrd gives you error message called:
"This option is not available or cannot be configured through this tool: fanspeed/fanctrlovrd".
I think the option is locked out in BIOS, can anybody try this through dell's CCTK and see if it works?

 

Has anybody tried using a memory or hex editor to locate the value being pushed to control the fans and modify it live? I remember using those to "hack" (more like Game Genie really) computer games back in the day.

 

Out of curiosity, does I8KfanGUI no longer work in Windows 10, or with newer Dell hardware, or is its precision lower than desired? I've always used it on my ancient Dell. With a fan policy set up and a bit of undervolting and underclocking, it can run fanlessly.

Now it would be really cool to be able to set the RPMs to increase more gradually with temperature. But I get over 5 minutes of silence at 100% CPU usage in my best-battery-life/lowest-noise configuration, which means in a realistic use case it would be silent indefinitely.

 

Those with a Dell 7577 where this program is working: What bios version are you on?
I'm on 1.4.2 and I cannot disable EC....

 

how is the experiment going? is there any issue caused ?

 

i got a question, normally when i game like playing escape from tarkov, ets2mp, csgo, squad, cpu reaches 80c and gpu stays near 60c. while at those temps i can see that in hwinfo fans are running at 6000rpm. but the thing is with this utility i can only set max of 4900rpm which is worse for me. also i dont think that it is a bug of hwinfo cause there is a noticable diffrence between those rpms. any solution? also i have Dell 7577 1050ti version

 

Has anyone tried this on G3/G5/G7?

 

I just tried with Inspiron 5577, but Windows crash to bluescreen soon as I start Dell Fan utility. However the guide is not clear to me. Is this the only thing I need to do before?
bcdedit.exe -set TESTSIGNING ON