lm-sensors not display fan speed

English Hardware
1

Hello, when I run sensors I get temperature reading only, but no fan speed

[amdgpu-pci-0700
Adapter: PCI adapter
vddgfx:           N/A  
vddnb:            N/A  
edge:         +40.0°C  

k10temp-pci-00c3
Adapter: PCI adapter
Tctl:         +40.8°C  
Tdie:         +40.8°C /CODE]


I tried sudo sensors-detect
[CODE# sensors-detect version 3.6.0
# Board: ASUSTeK COMPUTER INC. PRIME A320M-K
# Kernel: 5.14.6-1-default x86_64
# Processor: AMD Ryzen 3 2200G with Radeon Vega Graphics (23/17/0)

This program will help you determine which kernel modules you need
to load to use lm_sensors most effectively. It is generally safe
and recommended to accept the default answers to all questions,
unless you know what you're doing.

Some south bridges, CPUs or memory controllers contain embedded sensors.
Do you want to scan for them? This is totally safe. (YES/no): y
Module cpuid loaded successfully.
Silicon Integrated Systems SIS5595...                       No
VIA VT82C686 Integrated Sensors...                          No
VIA VT8231 Integrated Sensors...                            No
AMD K8 thermal sensors...                                   No
AMD Family 10h thermal sensors...                           No
AMD Family 11h thermal sensors...                           No
AMD Family 12h and 14h thermal sensors...                   No
AMD Family 15h thermal sensors...                           No
AMD Family 16h thermal sensors...                           No
AMD Family 17h thermal sensors...                           Success!
    (driver `k10temp')
AMD Family 15h power sensors...                             No
AMD Family 16h power sensors...                             No
Hygon Family 18h thermal sensors...                         No
Intel digital thermal sensor...                             No
Intel AMB FB-DIMM thermal sensor...                         No
Intel 5500/5520/X58 thermal sensor...                       No
VIA C7 thermal sensor...                                    No
VIA Nano thermal sensor...                                  No

Some Super I/O chips contain embedded sensors. We have to write to
standard I/O ports to probe them. This is usually safe.
Do you want to scan for Super I/O sensors? (YES/no): y
Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor/ITE'...               No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               No
Trying family `ITE'...                                      Yes
Found `ITE IT8655E Super IO Sensors'                        Success!
    (address 0x290, driver `to-be-written')
Probing for Super-I/O at 0x4e/0x4f
Trying family `National Semiconductor/ITE'...               No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               No
Trying family `ITE'...                                      No

Some systems (mainly servers) implement IPMI, a set of common interfaces
through which system health data may be retrieved, amongst other things.
We first try to get the information from SMBIOS. If we don't find it
there, we have to read from arbitrary I/O ports to probe for such
interfaces. This is normally safe. Do you want to scan for IPMI
interfaces? (YES/no): y
Probing for `IPMI BMC KCS' at 0xca0...                      No
Probing for `IPMI BMC SMIC' at 0xca8...                     No

Some hardware monitoring chips are accessible through the ISA I/O ports.
We have to write to arbitrary I/O ports to probe them. This is usually
safe though. Yes, you do have ISA I/O ports even if you do not have any
ISA slots! Do you want to scan the ISA I/O ports? (yes/NO): y
Probing for `National Semiconductor LM78' at 0x290...       Success!
    (confidence 6, driver `lm78')
Probing for `National Semiconductor LM79' at 0x290...       No
Probing for `Winbond W83781D' at 0x290...                   No
Probing for `Winbond W83782D' at 0x290...                   No

Lastly, we can probe the I2C/SMBus adapters for connected hardware
monitoring devices. This is the most risky part, and while it works
reasonably well on most systems, it has been reported to cause trouble
on some systems.
Do you want to probe the I2C/SMBus adapters now? (YES/no): y
Using driver `i2c-piix4' for device 0000:00:14.0: AMD KERNCZ SMBus
Module i2c-dev loaded successfully.

Next adapter: AMDGPU DM i2c hw bus 0 (i2c-0)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: AMDGPU DM i2c hw bus 1 (i2c-1)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: AMDGPU DM aux hw bus 1 (i2c-2)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: SMBus PIIX4 adapter port 0 at 0b00 (i2c-3)
Do you want to scan it? (YES/no/selectively): y
Client found at address 0x50
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 Yes
    (confidence 8, not a hardware monitoring chip)
Probing for `EDID EEPROM'...                                No
Client found at address 0x51
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 Yes
    (confidence 8, not a hardware monitoring chip)

Next adapter: SMBus PIIX4 adapter port 2 at 0b00 (i2c-4)
Do you want to scan it? (YES/no/selectively): y

Next adapter: SMBus PIIX4 adapter port 1 at 0b20 (i2c-5)
Do you want to scan it? (YES/no/selectively): y


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

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

Driver `k10temp' (autoloaded):
  * Chip `AMD Family 17h thermal sensors' (confidence: 9)

Note: there is no driver for ITE IT8655E Super IO Sensors yet.
Check https://hwmon.wiki.kernel.org/device_support_status for updates.

No modules to load, skipping modules configuration.

Unloading i2c-dev... OK
Unloading cpuid... OK
]

So it is ITE IT8655E and National Semiconductor LM78, but when I run sudo modprobe -v lm78 nothing changes. I googled and found this https://github.com/electrified/asus-wmi-sensors but it says that "The WMI implementation in some of Asus’ BIOSes is buggy. This can result in fans stopping, fans getting stuck at max speed, or temperature readouts getting stuck. Is there any chance that it can be acomplished in the safe way? I’am Linux newbie. My motherboard is Asus a320m-k.

2

Although you describe yourself as Linux newbie, the site you found is I think the best information you will find.

I would try to follow the receipt under “Other Distrubtions” and build the kernel module.

On the page there is “Ensure you have lm_sensors, DKMS, kernel sources, GCC etc installed” so likely you have to install:

  • The devel_kernel pattern
  • The devel_C_C++ pattern
  • libsensors4-devel
  • dkms
3

Hi
That board should use the it87 module for the IT8655E chip, if you modprobe that what happens?

I see info here: https://wiki.archlinux.org/title/lm_sensors so might need to add a /etc/modprobe.d/it87.conf file;


options it87 force_id=0x290
4

@malcolmlewis

When I modprobe it87 it says ERROR: could not insert ‘it87’: No such device

@marel

I’am reluctant to this because author of the driver writes:

" The WMI implementation in some of Asus’ BIOSes is buggy. This can result in fans stopping, fans getting stuck at max speed, or temperature readouts getting stuck.Until you have subjected your computer to an extended soak test while polling the sensors frequently, don’t leave you computer unattended "

So, to me, it is too much risk for such small issue. I quit, but thank you very much for the replies.