戴尔OptiPlex 3070（小尺寸Ubuntu Server系统）CPU风扇转速查看方法咨询

问题背景 #

我手头有一台小尺寸的戴尔OptiPlex 3070，运行Ubuntu Server系统，想查看CPU风扇的实时转速，但用sensors命令时，输出里完全没有风扇转速相关信息。

我的系统版本信息：

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.2 LTS
Release:        22.04
Codename:       jammy

初始执行sensors的输出：

$ sensors

coretemp-isa-0000

Adapter: ISA adapter

Package id 0:  +33.0°C  (high = +74.0°C, crit = +82.0°C)

Core 0:        +31.0°C  (high = +74.0°C, crit = +82.0°C)

Core 1:        +30.0°C  (high = +74.0°C, crit = +82.0°C)

Core 2:        +33.0°C  (high = +74.0°C, crit = +82.0°C)

Core 3:        +32.0°C  (high = +74.0°C, crit = +82.0°C)

acpitz-acpi-0

Adapter: ACPI interface

temp1:        +27.8°C  (crit = +119.0°C)

pch_cannonlake-virtual-0

Adapter: Virtual device

temp1:        +36.0°C

nvme-pci-0200

Adapter: PCI adapter

Composite:    +29.9°C  (low  = -273.1°C, high = +81.8°C)

(crit = +84.8°C)

Sensor 1:     +29.9°C  (low  = -273.1°C, high = +65261.8°C)

Sensor 2:     +30.9°C  (low  = -273.1°C, high = +65261.8°C)

我也运行了sensors-detect工具扫描，结果里只推荐加载coretemp模块，没提到风扇相关驱动：

# sensors-detect version 3.6.0

# System: Dell Inc. OptiPlex 3070

# Board: Dell Inc. 02N3WF

# Kernel: 5.15.0-67-generic x86_64

# Processor: Intel(R) Core(TM) i3-9100T CPU @ 3.10GHz (6/158/11)

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): YES

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...                           No
AMD Family 15h power sensors...                             No
AMD Family 16h power sensors...                             No
Hygon Family 18h thermal sensors...                         No
Intel digital thermal sensor...                             Success!
(driver `coretemp')
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): YES

Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor/ITE'...               No
Trying family `SMSC'...                                     Yes
Found unknown chip with ID 0xcab0

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): YES

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): YES

Probing for `National Semiconductor LM78' at 0x290...       No
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): YES

Using driver `i2c-i801' for device 0000:00:1f.4: Cannon Lake-H (PCH)

Next adapter: SMBus I801 adapter at efa0 (i2c-0)
Do you want to scan it? (YES/no/selectively): YES
Client found at address 0x50
Handled by driver `ee1004' (already loaded), chip type `ee1004'
(note: this is probably NOT a sensor chip!)
Client found at address 0x52
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: i915 gmbus dpb (i2c-1)
Do you want to scan it? (yes/NO/selectively): yes

Next adapter: i915 gmbus dpc (i2c-2)
Do you want to scan it? (yes/NO/selectively): yes

Next adapter: i915 gmbus misc (i2c-3)
Do you want to scan it? (yes/NO/selectively): yes

Next adapter: i915 gmbus dpd (i2c-4)
Do you want to scan it? (yes/NO/selectively): yes

Next adapter: AUX C/DDI C/PHY C (i2c-5)
Do you want to scan it? (yes/NO/selectively): yes

Next adapter: AUX D/DDI D/PHY D (i2c-6)
Do you want to scan it? (yes/NO/selectively): yes

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

Driver `coretemp':
* Chip `Intel digital thermal sensor' (confidence: 9)

To load everything that is needed, add this to /etc/modules:
#----cut here----
# Chip drivers
coretemp
#----cut here----

If you have some drivers built into your kernel, the list above will
contain too many modules. Skip the appropriate ones!

Do you want to add these lines automatically to /etc/modules? (yes/NO)

Unloading cpuid... OK

解决方法与验证 #

后来我尝试加载戴尔专用的i8k内核模块，执行了以下命令：

sudo modprobe i8k force=1

再次运行sensors命令，就成功看到了风扇转速的信息：

$ sensors

dell_smm-isa-0000

Adapter: ISA adapter

fan1:        1184 RPM

coretemp-isa-0000

Adapter: ISA adapter

Package id 0:  +61.0°C  (high = +74.0°C, crit = +82.0°C)

Core 0:        +55.0°C  (high = +74.0°C, crit = +82.0°C)

Core 1:        +52.0°C  (high = +74.0°C, crit = +82.0°C)

Core 2:        +52.0°C  (high = +74.0°C, crit = +82.0°C)

Core 3:        +61.0°C  (high = +74.0°C, crit = +82.0°C)

acpitz-acpi-0

Adapter: ACPI interface

temp1:        +27.8°C  (crit = +119.0°C)

pch_cannonlake-virtual-0

Adapter: Virtual device

temp1:        +54.0°C

nvme-pci-0200

Adapter: PCI adapter

Composite:    +44.9°C  (low  = -273.1°C, high = +81.8°C)

(crit = +84.8°C)

Sensor 1:     +44.9°C  (low  = -273.1°C, high = +65261.8°C)

Sensor 2:     +53.9°C  (low  = -273.1°C, high = +65261.8°C)

如果想要让这个模块在系统启动时自动加载，可以编辑/etc/modules文件，添加一行i8k，这样每次开机后就不用手动执行加载命令了。

备注：内容来源于stack exchange，提问作者Mannekino