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I've upgraded to the latest kernel a few days ago and noticing my fan always working on AC power. My machine:

ASUS X550VX
Ubuntu 18.04.4 LTS
Kernel : Linux 5.3.0-42-generic

I've came across all questions here including : Fan working non-stop on Ubuntu 18.04, Fan Periodically Overspeeds When On AC Power, Different fan behaviour in my laptop after upgrade, what to do now? , loud fan on Ubuntu 14.04 and many more.

I've already added parameter acpi_enforce_resources=lax in my grub setting and also have i8kmon settings applied since the beginning installation of my Ubuntu (prev kernels). Here's the setting :

# External program to control the fans
set config(i8kfan)      /usr/bin/i8kfan

# Run as daemon, override with --daemon option
set config(daemon) 0

# Automatic fan control, override with --auto option
set config(auto) 1

# Report status on stdout, override with --verbose option
set config(verbose) 1

# Status check timeout (seconds), override with --timeout option
set config(timeout) 20

# Temperature thresholds: {fan_speeds low_ac high_ac low_batt high_batt}
# These were tested on the I8000. If you have a different Dell laptop model
# you should check the BIOS temperature monitoring and set the appropriate
# thresholds here. In doubt start with low values and gradually rise them
# until the fans are not always on when the cpu is idle.
set config(0)   {{0 0}  -1  55  -1  55}
set config(1)   {{0 1}  41  60  55  65}
set config(2)   {{1 1}  55  75  60  75}
set config(3)   {{2 2}  70 128  75 128}

# Speed values are set here to avoid i8kmon probe them at every time it starts.
set status(leftspeed)   "0 1000 2000 3000"
set status(rightspeed)  "0 1000 2000 3000"

# end of file

When I run i8kmon (on battery) :

reading system config file
i8kmon
config(0)          = {0 0} -1 55 -1 55
config(1)          = {0 1} 41 60 55 65
config(2)          = {1 1} 55 75 60 75
config(3)          = {2 2} 70 128 75 128
config(acpi)       = acpi
config(auto)       = 1
config(daemon)     = 0
config(i8kfan)     = /usr/bin/i8kfan
config(sysconfig)  = /etc/i8kmon.conf
config(t_high)     = 80
config(timeout)    = 20
config(use_conf)   = 1
config(userconfig) = ~/.i8kmon
config(verbose)    = 1
status(ac)         = 0
status(acpi_timer) = 0
status(leftspeed)  = 0 1000 2000 3000
status(lspeed)     = 0
status(lstate)     = -2
status(lstuck)     = 0
status(nfans)      = 2
status(rightspeed) = 0 1000 2000 3000
status(rspeed)     = 0
status(rstate)     = -2
status(rstuck)     = 0
status(state)      = 0
status(t_high)     = 0
status(t_low)      = 0
status(temp)       = 0
/usr/bin/i8kfan 0 0
1584518849 acpi: Battery 0: Discharging, 88%, 02:53:55 remaining
temp, left fan state, right fan state, ac state: -1 -1 -1 0
temp, left fan state, right fan state, ac state: -1 -1 -1 0

It's been working fine until I've upgraded kernel yesterday to 5.3.0-42. I can't help but noticing my fan is always ON and loud whenever it's on AC power. Even on idle, the fan is still loud. Compared to when I unplugged it, here's comparison of using AC power and battery power, screenshot taken just a few minutes apart after I unplugged the power cord, same environment, literally the same applications were opened :

On AC : enter image description here

On battery : enter image description here

If necessary, this is the result of cpupower frequency-info :

analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us
  hardware limits: 800 MHz - 2.80 GHz
  available frequency steps:  2.80 GHz, 2.80 GHz, 2.70 GHz, 2.50 GHz, 2.40 GHz, 2.20 GHz, 2.10 GHz, 1.90 GHz, 1.70 GHz, 1.60 GHz, 1.50 GHz, 1.40 GHz, 1.20 GHz, 1.10 GHz, 900 MHz, 800 MHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 800 MHz and 2.80 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 821 MHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes

I see many people having fan issue for Dell laptop and there's a specific way to fix it (installing dell-related module). Is there anything else I can do to minimize this fan issue, especially on ASUS ?

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