Hi,
for work, I have just got a Dell Precision 5560 with Intel i7-11800H.
I have installed Fedora 35 without any problems but I am not able to read the fan speed under
/sys/class/hwmon/*/fan*.
I am just interested in reading the current fan speed, not in controlling it.
Do you have any advice?
Thanks
Try installing lm-sensors sudo dnf install lm-sensors then run sensors-detect followed by sensors
This will allow you to read all sensors the hardware supports.
For a gui display you can also install ‘gkrellm’.
Thanks for the reply.
I have installed lm_sensors but still no fan speed.
$ sensors
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +61.0°C (high = +100.0°C, crit = +100.0°C)
Core 0: +58.0°C (high = +100.0°C, crit = +100.0°C)
Core 1: +60.0°C (high = +100.0°C, crit = +100.0°C)
Core 2: +60.0°C (high = +100.0°C, crit = +100.0°C)
Core 3: +56.0°C (high = +100.0°C, crit = +100.0°C)
Core 4: +56.0°C (high = +100.0°C, crit = +100.0°C)
Core 5: +57.0°C (high = +100.0°C, crit = +100.0°C)
Core 6: +59.0°C (high = +100.0°C, crit = +100.0°C)
Core 7: +58.0°C (high = +100.0°C, crit = +100.0°C)
nvme-pci-0200
Adapter: PCI adapter
Composite: +28.9°C (low = -0.1°C, high = +82.8°C)
(crit = +84.8°C)
Sensor 1: +28.9°C (low = -273.1°C, high = +65261.8°C)
Sensor 2: +31.9°C (low = -273.1°C, high = +65261.8°C)
iwlwifi_1-virtual-0
Adapter: Virtual device
temp1: +30.0°C
BAT0-acpi-0
Adapter: ACPI interface
in0: 11.91 V
curr1: 1000.00 uA
That output says there are no fan speed sensors found.
Looking at that laptop on the dell website it fails to tell me whether there is even a fan installed, but sensors certainly does not show a speed sensor.
My Asus laptop has 2 fans, but sensors only sees one.
If you monitor the CPU temp it should be adequate to tell you if the fan is providing enough cooling.
For sure there is a fan running as I can hear it under load.
I am interested in reading the fan rpm, as I can easily do on my Thinkpad W540, using the /sys/class/hwmon/*/fan* file.
Lenovo Thinkpad vs Dell Precision.
two different manufacturers, different motherboards, different bios —> ergo different approach to what they show the user.
I suspect you are out of luck unless you can get Dell to tell you how to read the fan speed. Dell does not directly support linux although Lenovo does. You probably are out of luck in that regard.
On my Asus laptop I get this
$ cat /sys/class/hwmon/*/fan*
5400
cpu_fan
and on my desktop with Asrock motherboard I get this
$ cat /sys/class/hwmon/*/fan*
0
0
726
0
2
0
0
0
0
1394
0
2
27000
1082
0
0
1424
0
2
0
0
0
0
786
0
2
0
0
0
0
712
0
2
0
0
0
0
0
2
0
0
4753
0
2
0
0
As I said, different hardware, different bios, different manufacturers, different detail presentation.
Hi, may be this what you looking for. It also available on Fedora Copr, you could search there and here one of them.
Btw for note only, not all fan have speed sensor (like mine). How this kind of fan work is the controller read the temperature sensor. If the temperature high, the controller send higher voltage to the fan and expect the fan run faster and doesn’t care with the fan speed.
Just tried to install it but:
$ i8kmon
can't open /proc/i8k: No such file or directory
while executing
"exec $config(i8kfan) $left $right"
(procedure "set_fan" line 29)
invoked from within
"set_fan $status(state)"
(procedure "main" line 8)
invoked from within
"main"
invoked from within
"if {$tcl_interactive == 0} {
main
vwait forever
}"
(file "/usr/bin/i8kmon" line 373)
$ i8kfan
can't open /proc/i8k: No such file or directory
$ sudo i8kfan
can't open /proc/i8k: No such file or directory
$ modprobe i8k
modprobe: ERROR: could not insert 'dell_smm_hwmon': Operation not permitted
$ sudo modprobe i8k
modprobe: ERROR: could not insert 'dell_smm_hwmon': No such device
Again, I think you are trying to read a sensor for fan speed which does not exist in that hardware.