First of all, thanks for your time.

> One bug report can track a problem across several packages, so there's
no need for multiple reports.

Sorry for the noise :-)

> If you can reproduce it with Hirsute

I can reproduce the problem using linux-image-generic 5.10.0.14.16 from hirsute 
in a tty.
To be sure I did it right, those are the steps I followed:

1. added this repo to the list of repos:
deb http://archive.ubuntu.com/ubuntu/ hirsute-proposed restricted main 
multiverse universe

2. updated apt list and installed those packages:
linux-headers-generic/hirsute-proposed
linux-modules-5.10.0-14-generic/hirsute-proposed
linux-modules-extra-5.10.0-14-generic/hirsute-proposed
linux-image-5.10.0-14-generic/hirsute-proposed

3. Rebooted, choose kernel 5.10 from advanced list in grub

4. On gnome login prompt, switched to tty with ctrl+alt+F3

5. Check kernel and packages:
$ uname -a
Linux bestia3 5.10.0-14-generic #15-Ubuntu SMP Fri Jan 29 15:10:03 UTC 2021 
x86_64 x86_64 x86_64 GNU/Linux

$ dpkg -l | grep 5.10.0
ii  linux-headers-5.10.0-14                    5.10.0-14.15                     
                all          Header files related to Linux kernel version 5.10.0
ii  linux-headers-5.10.0-14-generic            5.10.0-14.15                     
                amd64        Linux kernel headers for version 5.10.0 on 64 bit 
x86 SMP
ii  linux-headers-generic                      5.10.0.14.16                     
                amd64        Generic Linux kernel headers
ii  linux-image-5.10.0-14-generic              5.10.0-14.15                     
                amd64        Signed kernel image generic
ii  linux-modules-5.10.0-14-generic            5.10.0-14.15                     
                amd64        Linux kernel extra modules for version 5.10.0 on 
64 bit x86 SMP
ii  linux-modules-extra-5.10.0-14-generic      5.10.0-14.15                     
                amd64        Linux kernel extra modules for version 5.10.0 on 
64 bit x86 SMP

Now, calling 'sensors' from console still causes the problem, i.e. the output 
of sensors hangs a couple of seconds just after printing 'amdgpu-pci-0100' and 
the fans start spinning.
The only difference with kernel 5.10 wrt kernel 5.8 is that I don't see the 
kernel error messages directly into the tty, but they are present in dmesg:

[   25.039603] vboxdrv: TSC mode is Invariant, tentative frequency 2592005345 Hz
[   25.039607] vboxdrv: Successfully loaded version 6.1.18 (interface 
0x00300000)
[   25.251013] VBoxNetFlt: Successfully started.
[   25.253147] VBoxNetAdp: Successfully started.
[   41.364575] [drm] PCIE GART of 256M enabled (table at 0x000000F400000000).
[   41.493122] [drm] UVD and UVD ENC initialized successfully.
[   41.603133] [drm] VCE initialized successfully.
[   41.609182] amdgpu 0000:01:00.0: [drm] Cannot find any crtc or sizes
[   41.680294] rfkill: input handler enabled
[   47.719525] Bluetooth: RFCOMM TTY layer initialized
[   47.719530] Bluetooth: RFCOMM socket layer initialized
[   47.719535] Bluetooth: RFCOMM ver 1.11
***** END OF BOOT ******

***** Called 'sensors' in tty   vvv ******
[   96.156579] [drm] PCIE GART of 256M enabled (table at 0x000000F400000000).
[   96.285097] [drm] UVD and UVD ENC initialized successfully.
[   96.395079] [drm] VCE initialized successfully.
[   96.401254] amdgpu 0000:01:00.0: [drm] Cannot find any crtc or sizes


** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
       Status: Incomplete => Invalid

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-amdgpu in Ubuntu.
https://bugs.launchpad.net/bugs/1910562

Title:
  Fans switching on and off every 10 seconds after update to kernel
  5.8.0-34

Status in linux-signed-hwe-5.8 package in Ubuntu:
  Incomplete
Status in lm-sensors package in Ubuntu:
  Incomplete
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  Invalid

Bug description:
  After updating via apt dist-upgrade from kernel 5.4.0-59 to kernel
  5.8.0-34 the fan on my machine started switching on (for an instant)
  and off every 10 seconds even when idle with CPU at 48/50°C.

  Switching back to previous kernel solves temporary the problem, i.e.
  fans are always off with light desktop work.

  The new behavior is really annoying and I guess not healthy for the
  fans.

  I'm on latest Dell bios, with every other package updated.

  Di something in the thermal policies change between those two kernels?
  Is it possible to go back to previous behavior ?

  Thanks in advance for help

  Machine: Dell Precison 7540, intel i7-9750

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.8.0-34-generic 5.8.0-34.37~20.04.2
  ProcVersionSignature: Ubuntu 5.8.0-34.37~20.04.2-generic 5.8.18
  Uname: Linux 5.8.0-34-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jan  7 17:14:54 2021
  InstallationDate: Installed on 2020-05-06 (246 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: linux-signed-hwe-5.8
  UpgradeStatus: No upgrade log present (probably fresh install)

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