Apple smc fan control

hg_gts_350

Noticed my grep was wrong above, (shotty cut and paste job), should be the following for reference.

sysctl -a | grep -i asmc

As @stephenw10 said, you should be able to download the iso and extract the asmc.ko module from the image.

Then we can test it with :

kldload asmc.ko

The above grep should then return results, if it does we can make the change permanent by placing the file in the /boot/modules path. Possiblly add asmc_load="YES" to the /boot/loader.conf file if it doesn't get picked automatically on boot.

The only problem will come when kernel updates are pushed, we'd have to do the same procedure for each release.

(I'm only guessing with the above, I have more experience with arch/RHEL/debian based Linux distros rather than freebsd)

NollipfSense

@hg_gts_350 Okay, understand what you're saying ...while researching, I found this:

Code:

grep ipmi /etc/rc.conf

ipmi_load="YES"

kldstat | grep ipmi

4 1 0xffffffff81cc1000 113b0 ipmi.ko

pkg info | grep ipmi

ipmitool-1.8.17_1 CLI to manage IPMI systems

ipmitool sensor | grep -i fan | cut -f1-4 -d'|'

FAN MOD 1A RPM | 4440.000 | RPM | ok
FAN MOD 2A RPM | 4560.000 | RPM | ok
FAN MOD 3A RPM | 4440.000 | RPM | ok
FAN MOD 4A RPM | 4440.000 | RPM | ok
FAN MOD 5A RPM | 4560.000 | RPM | ok
FAN MOD 6A RPM | 4440.000 | RPM | ok
FAN MOD 1B RPM | 3000.000 | RPM | ok
FAN MOD 2B RPM | 3120.000 | RPM | ok
FAN MOD 3B RPM | 3120.000 | RPM | ok
FAN MOD 4B RPM | 3000.000 | RPM | ok
FAN MOD 5B RPM | 3120.000 | RPM | ok
FAN MOD 6B RPM | 3000.000 | RPM | ok
Fan Redundancy | 0x0 | discrete | 0x0180

So, since I have the 2011 Mac Mini server, I was thinking I should have a motherboard or logic board management controller and checked whether I have the ipmi-tool ... I have the tool.

[2.5.0-DEVELOPMENT][admin@NollipfSense.nollipfsense.lan]/root: sysctl -a | grep -i asmc
[2.5.0-DEVELOPMENT][admin@NollipfSense.nollipfsense.lan]/root: pkg info | grep ipmi
ipmitool-1.8.18_2 CLI to manage IPMI systems
[2.5.0-DEVELOPMENT][admin@NollipfSense.nollipfsense.lan]/root: kldstat | grep ipmi
[2.5.0-DEVELOPMENT][admin@NollipfSense.nollipfsense.lan]/root:

But it looks like I am missing the ipmi.ko module.

NollipfSense

@hg_gts_350 said in Apple smc fan control:

The above grep should then return results, if it does we can make the change permanent by placing the file in the /boot/modules path. Possiblly add asmc_load="YES" to the /boot/loader.conf file if it doesn't get picked automatically on boot.
The only problem will come when kernel updates are pushed, we'd have to do the same procedure for each release.

Don't know whether the OP is still here; however, I have added the asmc.ko module, rebooted, and update with daily snapshot without any issue. The hardware management tool that comes with FreeBSD - IPMI ... somehow I could not get it to work with the asmc.ko module nor with the ipmi.ko modules. It seems that it was expecting the ipmi.ko modules to be in /usr/src/sys/modules/ ... Src is intentionally left empty which suggest one of the changes made to FreeBSD 12.1. So, I'll download the Apple smc fan controller and give that a try over the weekend.

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stephenw10

With asmc loaded you should see some sysctls that relate to the settings available. sysctl dev.asmc

Also check the boot log to see if it attached to anything. Or load it after boot with kldload and then check the system log.

Also you should put custom loader variables in /boot/loader.conf.local otherwise they may all be overwritten.

Steve

NollipfSense

@stephenw10 said in Apple smc fan control:

With asmc loaded you should see some sysctls that relate to the settings available. sysctl dev.asmc

Also check the boot log to see if it attached to anything. Or load it after boot with kldload and then check the system log.

Also you should put custom loader variables in /boot/loader.conf.local otherwise they may all be overwritten.

Steve

Well Steve, it seems that I didn't carry out your instructions carefully ... I had downloaded and extracted from FreeBSD 12.1 RELEASE instead of FreeBSD 12.1 stable. I gathered that from the following images below. I will redo later. I didn't fine the file /boot/loader.conf.local

Screen Shot 2020-07-09 at 12.11.22 PM.png

Screen Shot 2020-07-09 at 12.51.24 PM.png

Screen Shot 2020-07-09 at 12.55.24 PM.png

hg_gts_350

Ok, I thought I'd let you guys know where I got to,

I went downloaded free BSD 11.3, (@NollipfSense, that's the version of free BSD iso you need to download as the current stable version of pfsense uses that kernel, hence your error above). Extracted the asmc.ko file from the iso, and ran kldload.

kldload asmc
asmc0: model not recognized

Unfortunately I found that my version of the Mac Mini is not supported by the kernel module, and I'd have to update the C header and class files (asmc.c and asmc.h) and build my own version of the 11.3 kernel just to get the kernal module to function. https://forums.freebsd.org/threads/asmc-on-macbook-pro-5-1.36722/

Although it does seem according to this that the asmc module does support my mac mini here, https://wiki.freebsd.org/IntelMacMini but it is in a later version of the kernel, so I could back port the asmc.h and asmc.c changes, build the kernel and it should work. But this was kind of defeating the purpose of using pfsense for me, since I was trying to move away from arch Linux for the sake of stability.

stephenw10

@NollipfSense is running a 2.5 snapshot which is built on 12.1-stable. Though kernel modules for 12.1-rel usually work there.

Maybe it's a much older snapshot built on 12.0-rel?

Steve

hg_gts_350

My mistake, apologies

hg_gts_350

This might be useful to anyone looking to try and get the asmc module working, you can pretty much check what version of mac is supported here:

https://svnweb.freebsd.org/base/stable/11/sys/dev/asmc/asmc.c?view=markup&pathrev=344889

and

https://svnweb.freebsd.org/base/stable/12/sys/dev/asmc/asmc.c?view=markup&pathrev=344888

stephenw10

Hmm, nothing that recent then. Driver needs some love upstream....

m_g_s_g

Sorry to nectropost. But I searched for "Mac Mini smc fan control" and this thread came up as one of the first ones.

This is just to document that I was able to compile and load an asmc.ko module for a Mac Mini 6,1.

This specific Mac Mini version is theoretically not supported, but just copying and adding to asmc.c the config for the last supported model (5,2) did the trick.

So I added this to /usr/src/sys/dev/asmc/asmc.c:

	/* Line ~304 : Patch for Macmini 6,1 */
	{ 
	  "Macmini6,1", "Apple SMC Mac Mini 6,1 (Late 2012)",
	  NULL, NULL, NULL,
	  ASMC_FAN_FUNCS2,
	  NULL, NULL, NULL,
	  ASMC_MM52_TEMPS, ASMC_MM52_TEMPNAMES, ASMC_MM52_TEMPDESCS
	},

	/* Patch for Macmini 6,2 */
	{ 
	  "Macmini6,2", "Apple SMC Mac Mini 6,2 (Late 2012)",
	  NULL, NULL, NULL,
	  ASMC_FAN_FUNCS2,
	  NULL, NULL, NULL,
	  ASMC_MM52_TEMPS, ASMC_MM52_TEMPNAMES, ASMC_MM52_TEMPDESCS
	},

NOTE that even if pfSense 2.5.2 is supposed to use a STABLE FreeBSD version, I was able to compile it with this source tree:

$ fetch ftp://ftp.freebsd.org/pub/FreeBSD/releases/amd64/amd64/11.2-RELEASE/src.txz
$ freebsd $ tar -C / -xvf ./src.txz

DISCLAIMER: Some temperature/fan sensors are reported to fail with messages shown in dmesg (expected, probably they don't exist in a Mac Mini 6,2). Only try to modify the existing ones as reported with:

$ kldload asmc.ko
$ sysctl -a | grep -i asmc

NollipfSense

Thanks to @bmeeks I finally saw the light in that I realized that Apple hardware, such as the Mac Mini, are made specifically for Apple's operation system. So, I have moved away from the platform in terms of my pfSense implementation and is now sporting a Lenovo Thinkcentre M93p SFF 120GB SSD 32GB RAM. Thank you Bill, I was stubborn as hell.

firemanwall

@m_g_s_g - To add to your nectropost, I'm sill searching for a way to regain fan control on my Mac mini 5,1 after updating from 2.4 >> 2.5. This thread is really the only source of relevant info I've been able to find.

At 2.4, I was able to simply download a VMDK of the corresponding FreeBSD version, extract the asmc.ko file and transfer it to my mini, but I'm struggling with this process in 2.5. I've tried following the same process I used before at 2.4, in this case using 12.2 RELEASE and 12.2 STABLE, but both fail.

Any chance you could help point me in the right direction to regain fan speed control on my 5,1 mini running 2.5? I'm not overly familiar with compiling, other than basic WLED and Tasmota projects which had easy-to-follow guides. If that is my only option, I too may have to repurpose one of my m93p's that's just collecting dust; I'm not a fan of running 70 degree idle temps where I was previously in the 40-50 range at 2.4 with manual fan control.

Thanks!

NollipfSense

@firemanwall said in Apple smc fan control:

If that is my only option, I too may have to repurpose one of my m93p's that's just collecting dust; I'm not a fan of running 70 degree idle temps where I was previously in the 40-50 range at 2.4 with manual fan control

That's why I gave up... couldn't stand seeing my mini heats up.

rmonster

Hi Guys,

I've joined to forum just to respond to this thread.

I've gotten everything to work on my older 2011 Mac Mini by doing the following:

Download and install the latest stable DVD ISO freebsd 12,2 and installing onto a VM
Edit the source file /usr/src/sys/dev/asmc/asmc.c as m_g_s_g mentioned
Used his code but added Macini5,1 and 5,2 as well, everything else the same.
Compiled the new asmc module by going to the source directory /usr/src/sys/modules/asmc and running make
Found where the complier placed the module by running find / -name asmc.ko. Note there are two of them, one already in boot and the other is the one you want with the current date and time, you can check with ls -l
Copied the module to my pFsense Mac Mini
Loaded the module to test with kldload ./asmc.ko
Then ran sysctl -a | grep -I asmc which resulted in sensor data dumped (yippie!)
Tested changing the fan speed by running: sysctl dev.asmc.0.fan.0.minspeed=3000
Verified that the fan speed had increased and cpu temperature dropped
Wrote dev.asmc.0.fan.0.minspeed=3000 to /etc/sysctl.conf for boot changes

CPU Temps dropped from high 60s to low to mid 50s.

I'll probably run this Mac Mini until it dies as a pFsense box now.

Hopefully this helps some of you make use of your older hardware.
P.S. I had an old thunderbolt to ethernet which I used as my second interface.

The box is pretty snapping and works great for gigabit internet and wifi with no slow downs.

Thanks to everyone that posted in this thread and helped me to get it working.

firemanwall

@rmonster said in Apple smc fan control:

Used his code but added Macini5,1 and 5,2 as well, everything else the same

THANK YOU! I feel so close, yet I can't get past the goal line on my 5,1.

Can you take a look at my process and see if anything stands out as incorrect?

The iso I started with is "FreeBSD-12.2-STABLE-amd64-20210930-r370694-disc1.iso" downloaded from https://download.freebsd.org/ftp/snapshots/ISO-IMAGES/12.2/

I created a VM in ESXi, installed from the above iso, then setup root ssh access and installed nano to simplify the edits (not a big VI fan).

Using nano, my specific edit to asmc.c is:

    /* The Mac Mini 5,1 has no SMS */
    {
      "Macmini5,1", "Apple SMC Mac Mini 5,1",
      NULL, NULL, NULL,
      ASMC_FAN_FUNCS2,
      NULL, NULL, NULL,
      ASMC_MM52_TEMPS, ASMC_MM52_TEMPNAMES, ASMC_MM52_TEMPDESCS
    },

I placed this between the Mac Mini 4,1 and 5,2 section of the code then saved the changes.

I also reviewed asmcvar.h, but didn't see anything to change as I "reused" the MM52 code for my 5,1 as shown above. I see you didn't note any changes there either.

I then moved to the source directory, ran make and don't see any obvious errors:
(I don't fully grasp this output to be honest)

root@freebsd:/usr/src/sys/modules/asmc # make
cc  -O2 -pipe -fno-common  -fno-strict-aliasing -Werror -D_KERNEL -DKLD_MODULE -nostdinc   -I. -I/usr/src/sys -I/usr/src/sys/contrib/ck/include -fno-common  -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fdebug-prefix-map=./machine=/usr/src/sys/amd64/include -fdebug-prefix-map=./x86=/usr/src/sys/x86/include   -MD  -MF.depend.asmc.o -MTasmc.o -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wundef -Wno-pointer-sign -D__printf__=__freebsd_kprintf__ -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas -Wno-error=tautological-compare -Wno-error=empty-body -Wno-error=parentheses-equality -Wno-error=unused-function -Wno-error=pointer-sign -Wno-error=shift-negative-value -Wno-address-of-packed-member -Wno-format-zero-length  -mno-aes -mno-avx  -std=iso9899:1999 -c /usr/src/sys/dev/asmc/asmc.c -o asmc.o
ld -m elf_x86_64_fbsd -d -warn-common --build-id=sha1 -r -d -o asmc.ko asmc.o
:> export_syms
awk -f /usr/src/sys/conf/kmod_syms.awk asmc.ko  export_syms | xargs -J% objcopy % asmc.ko
objcopy --strip-debug asmc.ko

I then found the new asmc.ko in /usr/obj/usr/src/amd64.amd64/sys/modules/asmc

From my pfSense mini, I then SCP'd the asmc.ko file directly into /boot/kernel

Holding my breath, I tried to kldload asmc.ko, yet get the same error as before:

kldload: an error occurred while loading module asmc.ko. Please check dmesg(8) for more details.

dmesg gives me the painfulyl familiar error:

KLD asmc.ko: depends on kernel - not available or version mismatch
linker_load_file: /boot/kernel/asmc.ko - unsupported file type

Where did I go wrong?

First thought was a version mismatch, but according to unmane -a, my pfSense install is:
12.2-STABLE FreeBSD 12.2-STABLE fd0f54f44b5c(RELENG_2_5_0) pfSense amd64

and the VM install I made the module with is:
FreeBSD freebsd 12.2-STABLE FreeBSD 12.2-STABLE r370694 GENERIC amd64

Am I using the wrong iso to start with? Am I overlooking something obvious?

I really can't thank you enough for taking time to follow up and share your positive results!

firemanwall

@rmonster

Too late to edit the above post, but I was in fact using the wrong iso to start with. Your awesome instructions worked perfectly when I started with the correct image.

The iso you want is "https://download.freebsd.org/ftp/releases/ISO-IMAGES/12.2/FreeBSD-12.2-RELEASE-amd64-dvd1.iso" from https://download.freebsd.org/ftp/releases/ISO-IMAGES/12.2/FreeBSD-12.2-RELEASE-amd64-dvd1.iso

YOU ROCK!

Before:

After:

rmonster

@firemanwall glad you got though man. Feels really good to put these old devices back to meaningful work

Forgot to mention to move the ko to the /boot/modules folder as well.

stephenw10

@rmonster said in Apple smc fan control:

Wrote dev.asmc.0.fan.0.minspeed=3000 to /etc/sysctl.conf for boot changes

You should just add that to Sys > Adv > System Tunables in the gui. The standard file will be overwritten by pfSense.

Steve

rmonster

@stephenw10 Awesome! thanks, will use that.