Date: Wed, 3 May 2023 02:06:02 +0200 From: "Dmitry N. Medvedev" <dmitry.medvedev@gmail.com> To: freebsd-acpi@freebsd.org Subject: managing a fan speed via memory address Message-ID: <CAPf62nErnFh7WjseZhjyhgohf2j%2BfLCm5of2yir8T=Eyi54NNA@mail.gmail.com>
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--0000000000003e894505fabed359 Content-Type: text/plain; charset="UTF-8" good morning, Recently I have learned about the dmidecode program and found the address of the FRNTFAN port in my HP Z420 machine: 0x0037. Since I am a complete newbie, I would like to learn if there is a way to read and change the value at this address. I need a bit of guidance. *The context*: I have added 8 SAS disks to the machine, put noctua fan in front of them and connected the fan to the FRNTFAN port on the motherboard. It looks like the fan works, but I am sure the disks would benefit if the fan produced more pressure. Which I fantasize I could do via changing the value at the said address. Not sure, of course. best regards, Dmitry N. Medvedev --0000000000003e894505fabed359 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div><div dir=3D"ltr" class=3D"gmail_signature" data-smart= mail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div>good m= orning,<div><br></div><div>Recently I have learned about the dmidecode prog= ram and found the address of the FRNTFAN port in my HP Z420 machine: 0x0037= .</div><div>Since I am a complete newbie, I would like to learn if there is= a way to read and change the value at this address.</div><div>I need a bit= of guidance.</div><div><br></div><div><b>The context</b>: I have added 8 S= AS disks to the machine, put noctua fan in front of them and connected the = fan to the FRNTFAN=C2=A0port on the motherboard.</div><div>It looks like th= e fan works, but I am sure the disks would benefit if the fan produced more= pressure. Which I fantasize I could do via changing the value at the said = address.</div><div>Not sure, of course.</div><div><br></div><div>best regar= ds,<br></div><div><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>D= mitry N. Medvedev</div></div></div></div></div></div></div></div></div></di= v></div></div> --0000000000003e894505fabed359--
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