Date: Tue, 2 May 2023 17:14:34 -0700 From: Adrian Chadd <adrian@freebsd.org> To: "Dmitry N. Medvedev" <dmitry.medvedev@gmail.com> Cc: freebsd-acpi@freebsd.org Subject: Re: managing a fan speed via memory address Message-ID: <CAJ-VmonUyHkBBbQSZsL-ur6LYy0eRs%2Buf-qaSjF_WQwVKAXVUQ@mail.gmail.com> In-Reply-To: <CAPf62nErnFh7WjseZhjyhgohf2j%2BfLCm5of2yir8T=Eyi54NNA@mail.gmail.com> References: <CAPf62nErnFh7WjseZhjyhgohf2j%2BfLCm5of2yir8T=Eyi54NNA@mail.gmail.com>
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--000000000000c6bffa05fabef185 Content-Type: text/plain; charset="UTF-8" Is it not an ACPI driver? If not, you could write a quick fan driver! Is there a thermal sensor(s) you could read to see how warm they get? -adrian On Tue, 2 May 2023 at 17:06, Dmitry N. Medvedev <dmitry.medvedev@gmail.com> wrote: > 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 > --000000000000c6bffa05fabef185 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Is it not an ACPI driver? If not, you could write a quick = fan driver!<div><br></div><div>Is there a thermal sensor(s) you could read = to see how warm they get?</div><div><br></div><div><br></div><div><br></div= ><div>-adrian</div><div><br></div></div><br><div class=3D"gmail_quote"><div= dir=3D"ltr" class=3D"gmail_attr">On Tue, 2 May 2023 at 17:06, Dmitry N. Me= dvedev <<a href=3D"mailto:dmitry.medvedev@gmail.com">dmitry.medvedev@gma= il.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m= argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left= :1ex"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><div><div dir= =3D"ltr"><div>good morning,<div><br></div><div>Recently I have learned abou= t the dmidecode program 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.</d= iv><div>I need a bit of guidance.</div><div><br></div><div><b>The context</= b>: I have added 8 SAS disks to the machine, put noctua fan in front of the= m and connected the fan to the FRNTFAN=C2=A0port on the motherboard.</div><= div>It looks like the fan works, but I am sure the disks would benefit if t= he fan produced more pressure. Which I fantasize I could do via changing th= e value at the said address.</div><div>Not sure, of course.</div><div><br><= /div><div>best regards,<br></div><div><div dir=3D"ltr"><div dir=3D"ltr"><di= v dir=3D"ltr"><div>Dmitry N. Medvedev</div></div></div></div></div></div></= div></div></div></div></div></div> </blockquote></div> --000000000000c6bffa05fabef185--
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