If it helps, I’ve gathered some readings while the external monitor is
plugged in and the fans are spinning:

Output of nvidia-smi:

     
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 550.107.02             Driver Version: 550.107.02     CUDA 
Version: 12.4     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile 
Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  
Compute M. |
|                                         |                        |            
   MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA GeForce RTX 3060 ...    Off |   00000000:01:00.0  On |            
      N/A |
| N/A   35C    P8             11W /   80W |      46MiB /   6144MiB |      0%    
  Default |
|                                         |                        |            
      N/A |
+-----------------------------------------+------------------------+----------------------+
                                                                                
         
+-----------------------------------------------------------------------------------------+
| Processes:                                                                    
          |
|  GPU   GI   CI        PID   Type   Process name                              
GPU Memory |
|        ID   ID                                                               
Usage      |
|=========================================================================================|
|    0   N/A  N/A      3733      G   /usr/bin/gnome-shell                       
    42MiB |
+-----------------------------------------------------------------------------------------+


Output of sensors:

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +38.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +34.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +34.0°C  (high = +100.0°C, crit = +100.0°C)
Core 2:        +34.0°C  (high = +100.0°C, crit = +100.0°C)
Core 3:        +33.0°C  (high = +100.0°C, crit = +100.0°C)
Core 4:        +32.0°C  (high = +100.0°C, crit = +100.0°C)
Core 5:        +35.0°C  (high = +100.0°C, crit = +100.0°C)
Core 6:        +31.0°C  (high = +100.0°C, crit = +100.0°C)
Core 7:        +34.0°C  (high = +100.0°C, crit = +100.0°C)

nvme-pci-e100
Adapter: PCI adapter
Composite:    +46.9°C  (low  =  -0.1°C, high = +79.8°C)
                       (crit = +81.8°C)
Sensor 1:     +47.9°C  (low  = -273.1°C, high = +65261.8°C)

BAT1-acpi-0
Adapter: ACPI interface
in0:          16.78 V  
curr1:         0.00 A  

iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:        +48.0°C  

ucsi_source_psy_USBC000:001-isa-0000
Adapter: ISA adapter
in0:           0.00 V  (min =  +0.00 V, max =  +0.00 V)
curr1:         0.00 A  (max =  +0.00 A)

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +45.0°C

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https://bugs.launchpad.net/bugs/2081935

Title:
  Fan control stuck at high speed after upgrade to Ubuntu 24, thermal
  zone 6 fails to read sensor

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