[solved] lm_sensor missing with ryzen cpu

[Elleni]

I enabled every single kerneloption as module in hardware monitoring section of kernel, and sensors-detect says:

Now follows a summary of the probes I have just done.
Just press ENTER to continue: y

Driver `to-be-written':
* ISA bus, address 0x290
Chip `ITE IT8655E Super IO Sensors' (confidence: 9)

Note: there is no driver for ITE IT8655E Super IO Sensors yet.
Check http://www.lm-sensors.org/wiki/Devices for updates.

No modules to load, skipping modules configuration.

How can I enable temperature and fan control for my ryzen 5 on a asus prime b350 plus mainboard?

Only gpu temp and fanspeed shows up in sensors.

Do I have to do it like described here ? Is this the correct way to implement ?
https://linuxconfig.org/monitor-amd-ryzen-temperatures-in-linux-with-latest-kernel-modules

[Chiitoo]

The correct way, in my opinion, is that it would just work as expected. :]

It seems like the 'it87' driver included in the kernel is not new enough to have the support it does upstream.

See: github.com/groeck/it87 - Add support for IT8655E #11

So while 'sensors-detect' won't be of help, just plain 'sensors' should give out a reading, as long as a recent enough version of the 'it87' driver has been loaded up successfully.

Your post actually made me finally look more deeply into this, since my Asus Prime X370-A has the same chip, and I've been unable to get it to work myself. So thank you!

I just built the module from upstream, and it does do something:

[Elleni]

I tried that module from the link and with that one it works. I have just to modprobe the module myself, as it is aparently not loaded automatically by udev. Thanks for confirmation. I was thinking too, that this should work out of the box, as kernel contains this module. But this workaround works.

[wrc1944]

Elleni,
Try putting

[Elleni]

Hi, I managed to let it autoload adding it to /etc/modules-load.d/it87.conf following the instructions on
https://linuxconfig.org/monitor-amd-ryzen-temperatures-in-linux-with-latest-kernel-modules

But not adding the option options it87 force_id=0x8622 in /etc/modprobe.d/it87.conf

Also emerged gkrellm ty

[Elleni]

This module does not compile anymore with kernel-4.15. Is there a way to get it working with new kernel ? It built with every kernel from 4.9.66 up to 4.14.15

[wrc1944]

I don't have it87 on my new AM4 system (had it on several AM3+ boards), but I just looked in my 4.15.0 source, and it's still right there in the kernel .config file, where it always has been for many years.
# CONFIG_SENSORS_IT87 is not set

When you compile the 4.15.0 kernel just enable it as a module. Some AM4 board use it87, but others are using CONFIG_SENSORS_NCT6775=m.

Are you sure your board is using the it87 sensors chip? My ASrock boards (B350 and x370 models) are both using the Nuvoton NCT5577D/NCT6776F Super IO Sensors chip.

If you have easy access you could look on the motherboard to check what sensor chip it has.

EDIT: Just realized after reading Chiitoo's post above that maybe the it87 code has changed in 4.15.0.

I recall doing something like replacing ( the relevant file(s) in the new kernel with the same file(s) from a recent kernel that worked (for my wifi adapter), before compiling the new kernel that didn't work. Worked like a charm.

If nothing else works, might be worth a shot trying the same sort of thing with the it87, assuming that's the chip you actually have on the board.

Not sure about the gcc 7.3 and binutils 2.30 followed by emerge -e world. Did you compile the kernel before or after the -e @world?

EDIT2: I did check the /usr/src/linux-4.14.15-gentoo/drivers/hwmon/it87.c file in both 4.14.15 and 4.15.0, and they are both 104,147 in size, but 4.14.15 was modified jan. 28, 2018, and 4.14.15 modified nov. 12,2017 and 4.14.13 file was identical to 4.14.15
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Main box- AsRock x370 Gaming K4
Ryzen 7 3700x, 3.6GHz, 16GB GSkill Flare DDR4 3200mhz
Samsung SATA 1000GB, Radeon HD R7 350 2GB DDR5
OpenRC Gentoo ~amd64 plasma, glibc-2.39-r7, gcc-14
kernel-6.9.3 USE=experimental python3_12.3-final

[Elleni]

Hello,

the point is, yes it87 is in kernel but it is not in a new enough version aparently. See Chiitoo's post. Thus I had installed it87 from following link, which worked perfectly:

https://linuxconfig.org/monitor-amd-ryzen-temperatures-in-linux-with-latest-kernel-modules

This still works - i come from trying - with 4.14 kernels and older. Even with actual system, compiled with gcc-7.3 and binutils-2.30 so those are not the source of the problem.

I then retried with it87 compiled as module in the version gentoo-sources deliver, and it is aparently still not recent enough it87 as

modprobe it87 gives modprobe: ERROR: could not insert 'it87': No such device

Unfortunately the procedure linked above does not work anymore with new 4.15 kernel. Trying to build module for this kernel:

[Elleni]

After having seen, that the newest file on github are ~3 weeks old, I decided to delete source, I used for the last months and issued:

git clone https://github.com/groeck/it87.git

to get newest source. And that did the trick. Now it compiles fine and I have my sensors back for 4.15 kernel. -> solved

[wrc1944]

Nice job on fixing this one!. So it87 in 4.15.rc9 works and 4.15.0 doesn't, and github version does? Weird. Seems like nothing should have changed in one little sensor file from rc9.
_________________
Main box- AsRock x370 Gaming K4
Ryzen 7 3700x, 3.6GHz, 16GB GSkill Flare DDR4 3200mhz
Samsung SATA 1000GB, Radeon HD R7 350 2GB DDR5
OpenRC Gentoo ~amd64 plasma, glibc-2.39-r7, gcc-14
kernel-6.9.3 USE=experimental python3_12.3-final

[Elleni]

Exactly thats why I was not thinking about to need to update the sources I had downloaded some months ago. And yes, I had tested them on git-sources 4.15-rc9. I would appreciate to see them in main kernel sources but until that I can live with manual compile of this module.

I just wanted to mail the maintainer of this, and then thought maybe just test with re-download sources first.

[marcuse]

In Kernel 4.15 the k10temp was updated to support Ryzen temperatures directly, no need for it87 et al.
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[Elleni]

Well yes and no. Thanks for the pointer. I come from trying and indeed temperature works with k10temp. But still need it87 for Voltages. Then it reports 3 different temperatures whereas k10temp just shows one. And last but not least it87 shows rpm of my 3 fans. Until I find inkernel alternatives, it87 is still usefull for me.

[Elleni]

Sorry for digging out this old post, but I would like to know, what nowadays is used for monitoring Asus B350Plus Motherboard sensors with a first gen Ryzen 5 1600 cpu. Is k10temp the only thing available? With groek's it87 not being there anymore, I wonder if there are other ways to get more values out of my motherboard. Ex. fan speeds, maybe RAM temperature. My gpu (radeon rx580) is monitored by amdgpu module. I did not test the it87 module in actual gentoo sources as in 4.15 times, the module did not work and one needed the version supported by groek which disappeared sometime ago.

The reason I am asking, that I'd like to look into folding @home and having my cpu and ram slightly overclocked, I'd like to keep an eye on it's temperatures.

[Ant P.]

k10temp in kernel 5.6 is much more detailed with Zen chips, there's per-chiplet temperatures and two voltage/current pairs.

If you intend to run F@H then turn off all overclocking, including core boosting. F@H uses AVX-heavy code; on a Ryzen the vector units are independent of the logical cores and do not share their clocks, so all you'd be doing is wasting power.

[Marlo]

Now this works with the original kernel module from 5.6.2.

[leandrolnh]

Maybe you have more luck using the ASUS WMI sensors driver provided by Ed Brindley:
https://github.com/electrified/asus-wmi-sensors

It works fine for me on ASUS Crosshair VI Hero:

[ipic]

The github readme page points to an overlay with an ebuild. Unfortunately this ebuild uses vanilla-sources. So, if, like me, you use gentoo-sources, it doesn't help.

The generic instructions on the readme page didn't work for me, specifically, "make dkms" failed.

This is what worked for me to get the module compiled and installed (all run as root):

[Hu]

[Anon-E-moose]

Finally got mine working, 3700x/Prime x570-pro

[Chris1969]

[Marlo]

Hi Chris1969,

the solution of Anon-E-moose is correct.
nct6798 does the job.
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[Chris1969]

Hi Marlo

The sensor nct6798 is not part of my kernel config (5.10.27). I found CONFIG_SENSORS_NCT6775.

However the chip nct6775 does not show up and the module can't be loaded.

What is the solution of Anon-E-moose? To add acpi_enforce_resources=lax to the command line?

Thanks

[Marlo]

The designations are a bit confusing. But it is what it is.

[ipic]